From working out the best combinations of glyph spells and figuring out the weaknesses of particularly nasty monsters, to discovering secret areas and earning medals for beating bosses without being hit once, there's very little to fault Order Of Ecclesia.
Of course, ONM doesn't doubt that plenty of people will disagree. They'll moan about the music not being haunting enough, the fact that the hero is a lady or, more likely, that it's just too hard for them. But they will say this: ignore those fools and just go experience Order Of Ecclesia for yourself. You'll thank them for it in the end, they guarantee it.