A very large amount of opinions given in this thread are what I consider to be popular opinions, not unpopular opinions. Some of the below might fall in line with that, so yeah.

Final Fantasy VI - Boring story. Opera scene is meh.
Final Fantasy X - Tidus, Yuna and Seymour make this game close to unplayable for me.
Final Fantasy XIII - Great characters, good game.
Square-Enix - Still capable of making great games (this is not to say they ARE making them).
Oblivion - Not worth your money.
GTA IV - Unengaging and uninteresting.
JRPGs - Still better than WRPGs.
Pokémon since it's release - Not worth it, better off just re-purchasing the original.
Resident Evil since it turned FPS - Rubbish.
Wolf Kanno - Wrong Well, not always, but it's fun to put this in.
First Person Shooters - Not even close to as good as other genres.
Minecraft - Severely lacking in longevity.