not really complicated, more like "wtf i wanted to do this why did i get that? wtf?" --- PSVita no games? http://www.gamefaqs.com/boards/620272-playstation-vita/66080697 http://www.atlus.com/res/p4g_faithful_reviews_1.jpg
The pc version fixed a lot of things that were annoying in the 360 version; mainly faster load times, and texture popup.
Not that important, but what they fix about gameplay was much more brillant, we can switch on/off arts at will, allow 18 leaders, formation features are greatly exploited, scaling BR system from chainning, more implemented equipments, more playable characters...etc...
The battle system is pretty neat since you control both squads and individual party members.
The first few battles teach you about the battle mechanics and it's not really complicated.
What they teach us in game is nowhere near enough, although i'm a fan of the game, I still gotta say so, that doesn't make even 1/10 of what we need to know, thank god there's the wikia that reveal lights to us, otherwise i might have actually hated this game. Classes?Weapon type?Wield style?Arts developing?Weapon arts?Formation requirements?..etc.. There's no way you can figure out all of the those contents on your own.