You're comparing it to Super Mario Galaxy? The same Super Mario Galaxy with a 97 on Metacritic? The same SMG which is the second highest rated game of all time on GameRankings?
I don't think anyone was surprised by that.
As for NSMBWii, highly unlikely. Firstly, it's in 2D and doesn't really reinvent anything, the way SMG did. Secondly, giving GoTY to 2 Mario games in 3 years would be a little off.







