Valkyria Chronicles. Seriously, this game is so good it's untrue. It markets itself as a tactical strategy RPG, but essentially it's a turn based Battalion Wars. I really dislike stratergy RPGs, I never got past the 4th mission in Final Fantasy Tactics and can barely do the first few missions in Advance Wars, but this game has got me hooked. If you have a PS3 I really recommend you buy it, even just to look at it's gorgeous anime visuals.