The iPad game is good, but I wish the AI was better. I usually play two-player games because waiting for three AIs to play is boring, and losing even to the hardest AI is rare.
I find this commonly true of lots of iOS AI players: typically the AI's not so great that you can't beat a single opponent most of the time. And waiting for 3 other AI players to take their turn is, as you note, pretty boring when what you're looking for in an iOS game is a quick gaming fix.
One of my favorite games is Keltis: Das Orakel and I really enjoy the iOS implementation, but I find I can beat a single hard AI something like 95% of the time. It's harder to win against multiple AI's but I hate waiting for them all to move so I don't typically play against more than 1.