) I can safely say that My Little Pony: A New Generation was great! 
And here are my random thoughts:
My Little Pony: Rainbow Roadtrip ranking · 10:29pm Jul 21st, 2019
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)
My Little Pony: Rainbow Roadtrip GOOD
Nice to have a low-stakes adventure with no villain or really any antagonist. Just a nice slice-of-life special with some likeable new characters, a straight-forward story (albeit with some slow pacing in parts) and a sweet lesson about communities needing to come together to care about one another. I like big action set pieces and epic conflicts as much as the next guy, but sometimes you don't need those things to tell a good story. Most of the time, small and simple stakes can leave a bigger impact on an audience.
LINKS TO OTHER RANKING BLOGS
Season One
Season Two
Season Three
Equestria Girls
Season Four
Equestria Girls: Rainbow Rocks
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 (you're already here, you court jester)
Equestria Girls: Sunset's Backstage Pass
Season 9
Equestria Girls: Holidays Unwrapped
Friendship is Forever
Nicely said!
All around, this was just a nice little slice-of-life for the most part.
And frankly, as another point, the message about coming together is especially important in this day and age.