) I can safely say that My Little Pony: A New Generation was great! 
And here are my random thoughts:
Equestria Girls: Rainbow Rocks ranking · 12:23am Dec 27th, 2017
0/10 - AWFUL (unsalvageable, nothing to be gained from watching it, never should have been made, wouldn't recommend to anyone, completely butchers an important subject/teaches a horrible and downright toxic moral)
1/10 - HORRIBLE/BORING (tedious to sit through, hurts to watch it, a bore, no reason to watch it, whatever positive things about it are tiny and not enough to save it)
2/10 - VERY BAD (slightly less terrible, maybe it had that one character you liked or one/two jokes you laughed at that kept it from being a 1 but still very painful)
3/10 - BAD (the kind of bad where you're checking your watch over and over to see how much time is left before it finally finishes)
4/10 - MEDIOCRE (not awful but not really that good either)
5/10 - EH (average, didn't love it or hate it but you feel like you could've done something better with your time)
6/10 - DECENT (the first positive rating on this list, fine overall, you wouldn't watch it again but you are glad you saw it once)
7/10 - GOOD (enjoyable enough that you'd maybe watch it again in future, had some noteworthy flaws but is overall a worthwhile sit-through you'd recommend to someone)
8/10 - GREAT (a solid, enjoyable episode, very entertaining)
9/10 - EXCELLENT (very engaging, awesome, you really recommend it to anyone)
10/10 - MASTERPIECE (extremely engaging, teaches a valuable moral perfectly, definite must-see for anyone)
Equestria Girls: Rainbow Rocks MASTERPIECE
Holy Christ, this is long overdue. I'd forgotten about this whole MLP ranking thing I started but I guess it's only fair I get back to it (I can add that to my New Years Resolutions list). Anyways, what can I say about this movie that hasn't already been said? The humour is better, the villains are better with a better story that has higher stakes, the songs are better and it showcased the best redemption arc of the entire show. This was the film that made people decide to give Equestria Girls another chance and for good reason. To this day, still my favourite of these movies and one of my favourite episodes of the series (yes, I count it as an episode, it has the same crew working on it).
...
Oh, and also:
CHRIIIIIIIIISTMAAAAAAAAAAAAS!
LINKS TO OTHER RANKING BLOGS
Season One
Season Two
Season Three
Equestria Girls
Season Four
Equestria Girls: Rainbow Rocks (you're already here, you ninny)
Season Five
Equestria Girls: Friendship Games
Season Six
Equestria Girls: Legend of Everfree
Season Seven and Equestria Girls: Magical Movie Night
My Little Pony: The Movie
Equestria Girls: Forgotten Friendship
Season Eight and Equestria Girls: Rollercoaster of Friendship
My Little Pony: Best Gift Ever
Equestria Girls: Spring Breakdown
My Little Pony: Rainbow Roadtrip
Equestria Girls: Sunset's Backstage Pass
Season 9
Equestria Girls: Holidays Unwrapped
Friendship is Forever
Nostalgia Critic at the end, nice touch!
And yes, Rainbow Rocks had the best redemption arc of the series. It's really just a miracle, how they managed to bring Sunset Shimmer from a one-dimensional bullying brat to, well, probably one of the best characters in the series.