Developers still don't know what to do with the iPhone. It's like the Wii in its early days, where everyone had to scramble to get something on the strange, new system that people seemed to enjoy. With fourteen billion different apps on the App Store, it takes a lot to stand out, and it's easy to be buried under the heap. id's Doom Classic never had to worry about this problem. Since they started bringing their classic games to the phone with Wolfenstein it was apparent that anything they touched would get attention, and after a lengthy wait the original Doom has been ported over and is available for purchase.