Invincible, or as good as 2 hours in(if that) make it a touch ridiculous, 2 great fights in the game, very early on, incredibly dumb AI, ridiculously accurate weapons and powerful past the first hour of the game. Once you get a gun that actually puts bullets at the crosshair , which is basically the 3rd/4th gun onwards its just too easy. The "open world" also takes about 3 minutes, if that to get from one side all the way to the other, so open world, generally yes, tiny world, also yes.