As much as the Chicago sports media likes to lambaste Rex, stats show he's had a more successful 1st-complete season than the likes of John Elway and others in the past. Granted he has a lot more room to improve, but build a better offense around him and that will only work to his benefit. Many of them, as well as the pundits, say that the 2006 Bears team made it to the Super Bowl in spite of Rex, but had he not played a role in the success of that team they wouldn't have made it that far.
Rex's complete 2006 stats can be found here:
http://www.nfl.com/players/rexgrossman/profile?id=GRO597298