I see (and partially agree with) the original poster's point that combat is too easy, but I must strongly disagree with the principle that "the game is too casual".

The two are not the same thing, and the relative ease of combat should not be interpreted as being casual-friendly. Just like difficult combat should not be equated to hardcore gameplay.

Square-Enix can increase the difficulty of combat AND keep the game casual-friendly. More potent enemy abilities, more intelligent enemy AI are just a couple of ways.