No one wants him to perform like Rooney - we want him to perform like the player his performances throughout his pre-United career suggested he was.
You shouldn't need convincing by us that he's failing to do exactly what 'a second choice striker worth 23m pounds should be doing'. It's fairly obvious from watching a match that Berbatov himself isn't happy with his performances, and the last 2 weeks have taught us that SAF isn't happy either.
Berbatov looks constantly disgusted with himself on the pitch, and in interviews off it continually expresses disappointment with his form.
The game against Bayern last week made Ferguson's feelings about Berbatov's ability to contribute meaningfully to the team during key matches abundantly clear.
I think some of you are hanging your hats on the old 'I'm with SAF on this...' argument, ie: since Fergie is persevering with him he must be doing alright.
The fact is that Berbatov has been indulged more than any player I can think of throughout SAF's entire United era. Do you think someone so publically disillusioned with the game, showing such negative body language would have been tolerated by SAF in the 90's? Frankly, his attitude would have looked doubly horrendous seen in context of the great Keane, Bruce, Robson sides.
SAF is managing with one hand tied behind his back and I suspect he can't man-manage as he would like and as he has the last 25 years. He has to stick with Berbatov now but believe me, ten years ago he'd have been through the Old Trafford door in the summer, no question.