I love Angry Birds, but I do agree that we could use a little more variety in the games department and a better way to discover them. I think there is a huge barrier to games entering the app store ecosystem and doing well that are really played much better if they are not controlled with fingers on the screen.
I love fighting games, I don't really want to play them with my fingers on the screen. Same thing for shooters- I like to use the display to, you know, display things. Angry Birds is fine with touch controls because the act of touching the screen relates directly to the playability of the game itself, and I think that is part of its runaway success.
So why can't we get a case manufacturer to plug the gap and make a case that puts a cross on the left, a few buttons on the right, two triggers on the top or back, and essentially make the iPhone in to something that looks like the new NEO GEO portable?
I have seen the kick-starter iOS gamepad control systems and they are all crap- I want a case- a firm, nice case that actually allows you to use the phone without anymore compromise than a slight increase in size, and use it as a portable gaming device as well. I think this would break open the iOS game market to other genres of gaming besides ones that require touch as part of their playability.