Wilbon had an interesting take in his chat this week:
The Chat House - washingtonpost.com
He said that the offense lacks a truly great player that it can rally around - an icon who can inspire and lead them. Campbell, Portis, even Samuels, these guys are really good, but there's no one who is truly elite; and there's no one who's firey or galvanizing. I think Chicago showed last year that with good defense you can do well with a ho-hum offense, but maybe you can't ever really be better than sufficient.