Madden NFL 08 review at Gamespot.

"For those who bought Madden NFL 07 on the PSP last year, you are hereby excused from having to buy Madden NFL 08. It's not that the game has suddenly become awful, but this year's installment offers very little that it didn't offer last year. Sure, there's a new challenge mode that replaces the End-2-End mode from last year, a few of the bugs have been cleaned up, and a form of the new "weapons" system from the console versions of the game has made it into the PSP game. But these changes aren't enough on their own to warrant another $40 price tag, and when you factor in some of the holdover issues that still haven't been fixed, not to mention some new problems that debut in this year's game, the value becomes even more dubious. This is still a good, solid handheld football game. It just hasn't evolved much from the good, solid football game that came out last year."

Full Source: Gamespot