Madden 11 is a good game. Nothing more and nothing less. Once again EA has gone with a cartoon style to the design of the game which works for the Wii. It's fun for people who haven't played a lot of games and doesn't scare them away with amazing graphics like the ones on the PS3 and XBox360. But not too childish that make more hard-core fans feel like they are playing a game for their young brother. They put a Franchise Mode that doesn't need to be unlocked and it works and somewhat fun. The EA Trax are also fun and go with the game.
Though this is a fun game, it still a many annoying problems. First, the controls still are awful. You still have the two options of "point and click" or swing the remote as you were throwing a football. Point and click is the better one, but still is really frustrating to use. It hard to point to a receiver while trying to doge defenders. It is ok when you are running easy routes, but once they get a bit more complicated, it's like hitting a fly. The Franchise Mode doesn't have to much depth to it. If you are not into all the different options you could do in the older versions that fine. But for those who like all the details, it hard to play it for a long time. And I know I said that the design was fine, but it is hard to look at for at a long time without getting sick of it.
Also the 5vs5 is alright. Though I think a 7vs7 would work better. It would allow you one more o-lineman and a TE for offence. And Defense you could get another d-lineman and another linebacker.
I would say rent it, then hope that with the improvements they made this year will continue and be improved on even more in next years installment.