This is pathetic, and like others have mentioned, this should have just been left to an alternate mode. Having this art style as default with no ability to change it is not going to get people to buy the game. This decision seems worse than the All-Play idea, and I didn't think that was possible.
Believe it or not, there's more than just the "young" sports gamer demographic in the Wii userbase, and this will absolutely not attract anyone, and I mean ANYONE who considers themselves hardcore Madden players. Sure, most who consider themselves in that group probably have an HD console already, but there are some out there that would take a Wii version over other versions of the series if the graphics weren't so arcadey (which doesn't even include the Madden fans with just a Wii). You see, like I stated in my NCAA Football review, combining a realistic experience with an arcade feel just doesn't work. People don't play these games for an arcade experience, and Wii owners shouldn't have to either. It's almost like combining Gran Turismo with Cruisin' - ugly.
Obviously, these games aren't ALL about visuals, and just like 09 All-Play for Wii, I'm sure this year's Madden will completely exceed on the gameplay front, there's no doubt in my mind there. But a realistic atmosphere goes hand in hand with great gameplay in the series, which again, will be shot in this game.
The best way to tackle this issue, as I've stated before, is to go with a realistic experience (that not only has nice visuals, but all of the game modes you'd expect) that at the same time provides an All-Play-like mode for newcomers. But you just can't abandon your core audience for these newcomers, let alone only "young" newcomers or "arcade" football fans.
This current setup is a complete joke and further gives the notion that EA(Sports) feels the Wii console is comprised of gamers that just started gaming last year. If you really want to do something like this, you don't call it Madden, go all out and make a spin-off series. Madden is not and will never supposed to be like this. Ever.