I think there are two kinds of people in the world: Those who think iOS touch user interfaces are, on the whole, usable and "intuitive"; and those like me who find them sorta like getting a point-ed stick in the eye.

Generally speaking I find touch UIs to be sorta horrible the way they have been implemented on both Android and iOS. But somehow I think it is worse on iOS.

One exception is that I find Subdivformer / SDF 3D to be super freaking cool because of the immediacy of the touch UI, vs. things like Wings or Blender or anything that mostly requires mouse & keyboard.

(Related, I have to say the world of apps is just awful. Awful! I wanted to be able to resize an image on the iPad and of course that's like completely impossible out of the box, or even with the myriad painting apps I have already installed (or if they did have the ability god help me figuring it out). So I went to try to get something from the app store to do just that functionality and they all utterly failed, failed, failed. Bad UI, banner ads, full page ads, and then once I might have fought my way through all of that it turns out the ones I tried do not even give you the basic obvious standard gimpy/photoshoppy choices of resizing by various units. They all only supported resizing by pixels. Just! Complete! Epic! Fails of UX!)