I've had a stock rockhopper since March and use it for on-road and off-road riding.
1st complaint: Bottom bracket rust after 1 week. I didn't ride it through any water, simply the salty air by the coast did the damage.
2nd complaint: The rear wheel. I've heard very good things about Sun CR18 rims, but I've had about 7 incidents of broken spokes. The LBS finally sent it to Specialized and they sent it back with DT spokes. The LBS rebuilt it which is fine and dandy, but nobody bothered to check if it was true or not. Needless to say I'm not happy about that.
Other than that I'm very happy with the bike.