so, we first start with a big FFX ripoff. travel to shrines to pray and awaken the power that will bring peace to the land. and then it turns out to be a big lie. gee, that does sound familiar...?
the predictability of any given situation was just boring. for example, my roommate asked me what's the deal with kratos when i was first playing the game. i said "either he's your father, or he's going to betray you." gee, it was both!
using a character's body as a vessel for another resurrected person is a truly old chestnut (collette/martel) and the ridiculously confused factions in the story are too much to bother trying to untangle (even the characters make wisecracks about this.) cruxis, the renegades, the desians, half-elves... and the whole mithos/yggdrasil thing was painfully apparent forever in advance. exspheres are also not terribly original nor are they interesting.
towards the end of the story it just throws plot twist after plot twist at you (how many times does collette get kidnapped? how many times do you get betrayed? even genis gets kidnapped!) to try and keep it interesting but by this point i was well past caring.