I mean, it's harder for the iDevice to have to be able to show the complete enviroment. Yes, Infinity Blade is alot more fun for a longer time than Rage is.
There are probably several indie games currently in development that use the Unreal engine/UDK and will be ported to the iPhone. One example: Warm Gun. See http://www.moddb.com/games/warm-gun Trendy Entertainment is also working on a new title that might make it to the iPhone. The game will be called AfterLife and they are still looking for artists/animators. See http://forums.epicgames.com/showthread.php?p=27839884
Holy shit warm gun looks so ****ing good(looks a little like the actual game, Rage,) but if thats gonna be on iphone i'm gonna get that.
afterlife looks like left 4 dead but if all these games come on iphone i'm gonna get all of them. insta buy.