I found San Andreas, a shockingly awesome version of Dead Space, Modern Combat 4, Max Payne 1 to be quite playable on ipad. 8-bit and 16-bit classics were always there but it wont be long we find a scaled down version of Far Cry making it's way into the phones.
Also more yesteryear blockbusters are making their way into IOS/Android platforms (Baldurs Gate anyone?)
Now how many of you guys are into gaming on your cellphones? And how seriously do you take it?