Surprisingly good for a handheld Madden game! It delivers most of the thrills despite a few AI bugs.
The only issue I see is that the AI is a bit less consistent (aka FAIR) than its console big brothers. Most sports games have "catch-up AI", but Madden 10's is bad enough that you'll think you're playing the PS2 version! Your computer opponent has a knack for creating its own luck. Got your opponent in a 3rd-and-long situation? You can almost guarantee that the AI will complete its next pass for the first down. Are you caught in a 3rd-and short situation? The chances of your star receiver dropping his next pass are greatly increased. I've even seen the AI officials completely ignore a blatant pass interference call on what should have been an easy 3rd-down short pass. Basically, whatever the computer AI needs to win, it usually gets. Of course it's entirely possible to beat the AI, but you've got to play mistake-free football to do it. Even penalties have a habit of creeping-up at just the right time to bring a successful drive to a screeching halt!
Overall, Madden 10 on the PSP is an impressive game. You can now take the Madden experience with you wherever you go!