8.16 avg 30 episodes 8.3 → 8.8 21 min avg

Season 1 episodes — IMDb ratings
#	Title	Rating	Votes
1	Get the Party Started	8.3	78
2	Everybody Dance Now	7.9	43
3	Dance, Dance	8.0	45
4	Rock and a Hard Place	8.2	43
5	Steal My Sunshine	7.6	39
6	Good Girls Go Bad	7.6	32
7	Love Story	7.9	45
8	Just the Two of Us	7.8	36
9	Video Killed the Radio Star	7.5	35
10	Road to Joy	7.7	37
11	Can You Keep a Secret?	7.6	37
12	Get It Together	8.0	33
13	Don't Go Breaking My Heart	8.2	36
14	Sabotage	8.5	45
15	Changes	8.7	43
16	Help	8.2	37
17	Forget You	8.0	29
18	Brand New	8.4	29
19	First Date	8.3	38
20	We Are Family	8.0	32
21	Break Stuff	8.2	34
22	Come Back... Be Here	8.5	33
23	Dancing in the Street	7.6	33
24	Price Tag	9.1	53
25	Bad Moon Rising	8.6	47
26	Can't Fight This Feeling	7.9	34
27	I'm So Excited	8.2	39
28	Fancy Footwork	8.6	40
29	This Is How We Do It	8.8	35
30	Winner Takes All	8.8	57

8.62 avg 34 episodes 8.5 → 9.4 22 min avg

Season 2 episodes — IMDb ratings
#	Title	Rating	Votes
1	Don't Stop the Party	8.5	67
2	My Boyfriend's Back	8.5	33
3	Ready to Start	8.5	34
4	The Final Cut	8.8	37
5	The Girl Is Mine	8.2	30
6	Work It	8.1	23
7	It Takes Two	8.0	28
8	What I'll Do	8.0	26
9	Never Enough	8.1	19
10	I Hope I Get It	8.3	24
11	Anything You Can Do, I Can Do Better	8.0	25
12	Time to Move On	8.3	24
13	The Truth Comes Out	8.6	26
14	Sing	8.2	27
15	You're the One That I Want	8.4	22
16	Hazy Shade of Winter	8.5	29
17	Game On	9.2	33
18	Make a Plan to Love Me	8.6	23
19	Sacrifice	8.8	25
20	Heartbreaker	8.6	27
21	Hello Trouble	8.4	29
22	Lost	8.7	27
23	Better Than This	8.7	24
24	Under Pressure	9.2	36
25	Just Dance	9.1	33
26	Water It	8.1	24
27	Run This Town	7.8	21
28	Re-Match	9.0	32
29	Old Friends	9.2	34
30	I Don't Know	9.3	33
31	What Are You Waiting For?	9.4	56
32	You Love Me	9.3	38
33	Rewind	9.2	37
34	What Dreamers Do (Extended)	9.4	46

8.69 avg 30 episodes 8.7 → 9.4 21 min avg

Season 3 episodes — IMDb ratings
#	Title	Rating	Votes
1	Coming Home?	8.7	74
2	Game, Set and Match	8.3	36
3	Secrets	8.9	31
4	Let the Games Begin	8.8	26
5	The Fallout	8.8	31
6	The Times They Are a Changin'	9.0	43
7	Your New Beginning	8.5	27
8	I'm Your Captain	8.2	26
9	The Nutcracker Prince	8.5	28
10	Can't Fight This Feeling	8.0	32
11	Marry Me	8.2	29
12	Do the Right Thing	9.0	30
13	Put You First	8.4	20
14	I Hope I Get It	9.1	30
15	The New Girl in Town	8.6	25
16	Sweet Spot	8.6	27
17	Square Dance	8.5	28
18	Mixed Messages	8.7	24
19	Never There	8.4	24
20	Cry Me a River	8.5	24
21	Today I'm Getting Over You	8.3	23
22	It's My Party	9.1	37
23	Welcome to Miami	8.7	29
24	Lost at Sea	8.0	25
25	When the War Is Over	9.3	39
26	We Are the World	8.8	31
27	Blind	9.2	37
28	Turn, Turn, Turn	9.2	42
29	She's Not You	9.1	38
30	How It Ends	9.4	106

7.64 avg 40 episodes 8.6 → 6.8 22 min avg

Season 4 episodes — IMDb ratings
#	Title	Rating	Votes
1	One More Time	8.6	32
2	Stir It Up	7.8	23
3	Heads Will Roll	8.2	23
4	Welcome to the Jungle	7.8	20
5	Square One	8.2	24
6	London Calling	7.2	21
7	Walk This Way	7.9	17
8	Runaway	6.1	20
9	Dancing with Myself	8.2	27
10	Simple Twist of Fate	8.2	23
11	On the Rocks	8.3	26
12	Knowing Me, Knowing You	7.1	20
13	The Game Belongs to Me	7.2	19
14	I Can't Go for That	7.2	17
15	I Only Have Eyes for You	7.6	17
16	Love Will Tear Us Apart	8.1	17
17	Nobody's Fault But Mine	7.5	18
18	Your Time Is Gonna Come	7.5	20
19	How Deep Is Your Love?	7.5	20
20	Heat of the Moment	7.3	23
21	Kiss and Tell	7.5	21
22	Rumour Has It	6.7	21
23	Here Comes Your Man	6.6	19
24	Tainted Love	7.5	20
25	A Fool in Love	8.3	21
26	Come Together	7.2	21
27	Karma Police	8.8	25
28	Only You	8.6	24
29	Danger Zone	8.5	24
30	Rivalry	8.6	24
31	Nobody's Perfect	7.4	19
32	Shake It Off	7.1	16
33	It Ain't Easy	7.7	20
34	Bold as Love	8.4	35
35	Taking Care of Business	7.4	20
36	The Edge of Glory	7.0	16
37	Even Better Than the Real Thing	7.4	17
38	Don't Stop Me Now	7.3	16
39	Livin' on a Prayer	7.5	16
40	A Change Is Gonna Come	6.8	19

8.06 avg 20 episodes 8.3 → 8.8 22 min avg

Season 5 episodes — IMDb ratings
#	Title	Rating	Votes
1	A New Regime	8.3	32
2	Go West, Young Michelle	8.2	28
3	Dance, Lies and Hoverboards	7.3	22
4	Leon Me	7.6	23
5	It's All Fun and Games	6.9	21
6	No Good Deed	7.8	21
7	Heathers	8.1	21
8	12 Hour Party People	9.0	40
9	A Tale of Two Eldons	7.1	20
10	United and Divided	8.2	19
11	East Meets West	7.6	20
12	Brave New World	8.6	20
13	TNS: Civil War	7.7	18
14	Stand Together or Fall Apart	8.0	19
15	This Changes Everything	8.1	21
16	Stand and Deliver	8.1	20
17	Oh Brother! Why Art Thou Here?	8.4	27
18	I Have a Vision	8.5	17
19	Snap Decision	8.8	19
20	Pointe of No Return	8.8	22

8.57 avg 26 episodes 8.5 → 9.2

Season 6 episodes — IMDb ratings
#	Title	Rating	Votes
1	Grave New World	8.5	26
2	Wink It Out	8.6	20
3	Dance-Zilla	8.3	26
4	Coup d'Etat	9.0	26
5	Summer Lovin'	8.5	20
6	Mean Twirls	8.2	19
7	Oh Solo Me-Oh	8.2	20
8	Mash-Up Match-Up	8.3	16
9	Amy's Prom Has Got It Goin' On	8.3	21
10	Twinkle Toes	9.0	37
11	Never Been Picked	8.4	18
12	Convention Tension	8.7	19
13	Sweet and Salty	8.4	18
14	Ty'd to You	8.4	19
15	All the Marbles	8.4	17
16	Less Beauty, More Beast	8.2	18
17	Contemporary Contempt	8.3	19
18	Little Big Lies	8.3	27
19	Pas De Don't	8.3	19
20	Audition Subtraction	8.9	17
21	Dancing with the Enemy	8.9	28
22	His Girl, Summer	8.6	19
23	A-Troupe Escape	8.8	19
24	No Shell	9.1	36
25	And Then There Were Three	9.0	27
26	Piano Man	9.2	54

6.89 avg 26 episodes 8.3 → 4.3

Season 7 episodes — IMDb ratings
#	Title	Rating	Votes
1	It's a Wonderful Life, Piper - Part 1	8.3	33
2	It's a Wonderful Life, Piper - Part 2	8.7	34
3	The Goodbye Girl	9.0	38
4	The Comeback Kid	8.3	24
5	Alternate Universe	8.0	28
6	Three's a Crowd	7.4	26
7	Good Night and Good Luck	7.8	27
8	The Favourite	7.5	24
9	A Star Is Born	6.0	27
10	The Bicycle Thief	8.1	23
11	The Fall of Summer	8.0	24
12	A Tale of Two Auditions	7.2	24
13	There Can Only Be One	6.5	22
14	Lights, Camera, Action	5.7	23
15	A Fine Showmance	6.1	23
16	B-Troupe, Best Troupe!	8.5	26
17	The Absolute Face of Funder Bros	4.4	29
18	The Friendly Skies	5.0	25
19	Eight Crazy Dates	6.8	26
20	Just Duet	6.3	24
21	Big Decisions	8.4	27
22	Dance, Dance, Resurrection	5.5	22
23	Room Service	7.2	22
24	And So It Begins	5.5	27
25	Play it Again, Finn	4.7	28
26	It All Comes Down to This	4.3	46

7.88 avg 27 episodes 8.2 → 7.8

Season 8 episodes — IMDb ratings
#	Title	Rating	Votes
1	Today For You, Tomorrow For Me	8.2	30
2	Journey to the Past	8.0	21
3	I Can Do That	7.8	23
4	Another Suitcase in Another Hall	8.1	21
5	I Dreamed a Dream	8.2	21
6	Never Had a Friend Like Me	7.4	22
7	Perfect for You	8.1	18
8	My Philosophy	7.6	18
9	When I Grow Up	7.9	19
10	The Movie In My Mind	7.9	17
11	Tomorrow	9.0	21
12	You Can't Stop The Beat	8.6	16
13	One Song Glory	8.9	24
14	What'd I Miss?	7.3	13
15	Take Me or Leave Me	7.8	8
16	Anything You Can Do	8.0	7
17	How Do You Solve a Problem Like Maria?	8.1	9
18	Climbing Uphill	7.2	10
19	Worse Things	7.6	11
20	Any Dream Will Do	7.4	8
21	Maybe This Time	7.8	12
22	History has its eyes on you	7.4	9
23	All That's Known	7.6	9
24	What I Did for Love	7.3	12
25	Crossing a Bridge	7.7	12
26	Defying Gravity, Part 1	8.0	10
27	Defying Gravity, Part 2	7.8	13

8.31 avg 22 episodes 7.5 → 9.2

Season 9 episodes — IMDb ratings
#	Title	Rating	Votes
1	Count Me In	7.5	12
2	Tutu Can Play That Game	8.1	8
3	Setting the Barre	8.6	8
4	Tapped Out	7.9	10
5	Bad Attitude	8.7	10
6	Break Down	8.2	8
7	An Internationals Twist	8.7	10
8	Bridge the Gap	8.2	8
9	Off Balance	8.6	11
10	Beat the System	8.5	8
11	Swing Vote	8.8	10
12	Takes Two to Tango	8.4	7
13	Pointe of No Return	8.4	7
14	How'd It Turn Out?	8.0	8
15	Waltz Back In	8.0	7
16	Just Duet	8.0	6
17	That's a Stretch	7.8	6
18	Split the Difference	8.2	8
19	Dance, Party!	8.5	8
20	Can-Can We Do This?	8.8	6
21	Sole Connection	7.8	7
22	Take the Leap	9.2	6