Gameloft's entire library reminds me of Doom and WADs, except for Diablo. The Diablo 2 demo is alright, but the tap/touch mode still requires you to hit an attack button for some reason. I thought the controls in the Zelda DS games worked fine for the most part. Make a loot game with those controls and I'd buy it at the full $5 price point.
the best iphone games I've played so far are from Cave and IMDB Trivia
and I don't know if it's the 4S or this is how they were on the 4, but games look pretty good and run incredibly smooth. It's as or more impressive than stuff I've seen on my 3DS or PSP.
and to give Gameloft some praise, placing touch icons on the environment is pretty cool.