Oh boy, do I have quite a few.
I think Final Fantasy XIII is a fantastic game and a large improvement from X which also suffered from being a bit too linear, as XIII did not have random encounters to discourage any form of exploration. Added to this, I adore the character Vanille and how sweet and uplifting she is as a character. On the flip side of FF, I detest Final Fantasy IV and consider it to be highly generic. Like, it was the first in the series to have an emphasis on plot, but the plot is like a normal medieval fantasy like world, and I feel like its such a waste.
I believe Nobuo Uematsu is the worst of Square Enix's selection of composers, and that Hamauzu, Shimomura, Ishimoto, and Sakimoto are much better more interesting composers. I especially adore Yoko Shimomura and Hitoshi Sakimoto, and they're part of my main reasons for being so excited for KHIII, FFXV, Paper Mario: Paper Jam, and Odin Sphere Leifthreiser. (note that I know these aren't all Square games, but rather that some of them are games with these composers)
I believe Kingdom Hearts 1 aged like milk and that the lack of combo change, poor camera, and large emphasis on platforming hurt it tremendously as a game, something sequels fixed.
I believe most Western games in general are highly generic and derivative of each other, and I dislike the large focus on realism and lack of challenging and rewarding boss battles. I also don't like the Hollywood-esque soundtracks a lot of these games have, as I'd like it if music was a bit more melodic and catchy, and tried harder to be more unique.
I believe Square Enix is probably the best video game company out there and most consistent in its providing high quality titles. Nier, Drakengard 3, Kingdom Hearts 1.5/2.5, Bravely Default, Kingdom Hearts DDD, TWEWY....I like Square.
I believe Nier is the closest to perfect a video game has ever gotten, despite its flaws. Its just so strong in what it does, and even gameplay wise I appreciate its-Zelda like travel and combat.
Forgive me for bringing this one up, but its probably the most controversial gaming related thing I can say here that I have: I don't think Gamergate is a bad group. Note that I'm not saying its a good group either, but rather that I believe it to be something of a mixed bag of terrible and good things. Sort of like having good intentions but doing bad deeds-like thing, but not exactly. (I'm sorry if this sours up the thread; I don't intend to do so but you did ask for controversial gaming related opinions)