Its good but its like any other FPS i've tried on the platform. I use the 4S and the graphics are pretty superb but I just cant get the hang of FPS on the iphone. Try the 2nd one (think theres a lite version) and if you like how that plays, you'll like the 3rd one. Hope this helps.
Yeah same here, it's hard to control with a controller on a touch screen, it either is too sensitive or not sensitive enough and my finger will go too far off the on screen controller and I'll stop moving; but I'm def gonna try it out; thank you!