I have an ipad2...
I have the mass effect infiltrator game, its like a cover shooter, and I like it, but I find holding the ipad and controlling the game pretty tiring. It use controls like you would a twin stick gamepad but it because the ipad is so much larger than a gamepad it's a lot tougher to control for me.
I think there are some good games out there for it, but it just depends what kind of experience you want from it. Like temple run is an addictive simple game and fun for a while, but then you would need another experience, becuase it is just the same think over and over. I think a game like civilization could work well too.
Is gaming the only use you are curious to buy one for? They are pretty good for other things, like reading comics and stuff.