I actually liked it. The Raiders rap was pretty funny. Chris Henry at a high school, good stuff and Carson Palmer being forced to peel potatoes by Brutus was great. The Brett Favre wasn't too great but it was OK.
That's what I found the lamest... but to be honest, I've always found rap humor to be lame as hell. It's almost as bad as the gazillion poets who butcher "The Night Before Christmas" every year.