Check this out: I'll take some quotes from the article if you don't feel like reading it.
http://www.sportsline.com/nfl/story/10349731
"Young struggled to throw the football against the Jaguars in his season-opening victory, while Bush seemed to tap-dance to nowhere in his team's loss to the Colts. In talking to some scouts around the league this week, some thought Bush looked tentative at times, which is not what you want from a supposedly star back."
"So let's hold off on the ripping of Casserly and the Texans for making the pick. Williams, like I've said since he came out for the draft, will be a star. Aside from quarterbacks, star defensive ends, especially in this passing era, are the next most-valuable players.
That's not to say Bush won't be a good player, but he's a player that the Saints will have to scheme to make good. You can't just line him up and hand it off to him 25 times."
"Here's a good comparison for thought. Dwight Freeney is arguably one of the two best at his position of defensive end. Larry Johnson is considered second by many in the running back ratings. Freeney is in his sixth year, Johnson in his fifth.
The Colts gave Freeney $30 million in bonus money on the new deal he signed this year. Johnson got $19 million.
Score one for the defensive ends."