Although the uniformity of the character designs in MLP works to their benefit in that there are so many different customizable parts (such as mane, tail, and accessories), the uniformity of the character designs in EqG is indicative of stagnation, with everyone having the same body model which is thin as a twig and probably 65% legs, and everyone having very similar clothing styles as well.
The character design is just one example of how the EqG franchise is the product of corporate mandates. Even though Rainbow Rocks turned out to be a good film, many of us were almost turned off to it beforehand because of the absurdity of the concept of the entire Mane 6 being made to form a band. Overall, the decisions made in this franchise seem to promote conformity. That is the very thing the Season 5 premiere so thoroughly debunked, and the entire world of Equestria is pretty much against with such conceptions of individuality as cutie marks and the idea of friendship and harmony coming from the cooperation of diverse personalities.
The concept of setting a character from a world so tolerant of individuality and encouraging of personal achievements into a more realistic world with the reality of high school came up with plenty of chance to criticize adolescence as a social construct and the way our institutions breed conformity and separation. However, the first movie instead went to a cliche storyline of standing down a bully with the only difference being background elements of FiM being thrown in there, with a completely rushed and morally ambiguous resolution. The second movie similarly didn't do such a thing.
Overall, the concept of Equestria Girls is more fitting of a TV series, or a series of specials, than feature films, but even those would be a diversion of resources from the main series, said series itself being the main reason why we got into this franchise in the first place. If the EqG franchise had more of the same risk-taking story style of FiM rather than conforming to the stock of high school plots, I would speak more favorably of it, but the fact of the matter is it's "just another one" as far as high school media goes. I'm not expecting Daria here, but from the franchise that came out with FiM, I expect better than just following the leader.