Um, WWE - Wrestling, of course, this is the easiest for me! Since it's really easy to figure out what the controls are.
I believe Star Wars Battle Front 2 was pretty easy for an FPS game. There wasn't really much to it but you played as a soldier and conquered different worlds or you could've done campaign and do the same thing. There was an auto aim assist so it wasn't that hard to kill the enemy and win the game. I also thought that Kingdom Hearts 2 was pretty easy but the only hard thing about it was navigating where to go and what to do.