The word "great" sure gets used pretty liberally in the NFL Forum
Travis Henry's first 3 seasons:
3523 rushing yards, 27 TDs
646 rec yds, 2 TDs
Willis McGahee's first 3 seasons (not counting 2003 when he was out for the year):
3365 rushing yds, 24 TDs
503 receiving yds
Antowain Smith:
2578 rushing yards, 22 TDs (only started in 25 of first 48 games, too).
220 receiving yards
Had 2 rushing TD's in the forward-lateral playoff game too
Marshawn is my boy and he's been invaluable to Seattle, but he wasn't great in Buffalo--a lot of that has to do with the O-line and having J.P. Losman or Trent Edwards at QB, though...