Oh god, do you even watch football? I'll give you Peterson and Tomlinson, obviously. Addai, too, though he benefits from Manning just like Edge did. Westbrook, I'll give you.
Lynch, however, is a between the tackles banger, though a good one. Parker disappears for games on end. McGahee got run out of Buffalo by a mob. Ronnie Brown showed nothing until this year, then destroyed his knee. Larry Johnson's been pedestrian this year, at best, when not injured. Same for Steven Jackson. Rudi Johnson has been outshined by Kenny Watson; he's been terrible, as has Frank Gore. Cadillac Williams is chronically injured and has shown nothing of the sort of talent you're suggesting in his career.
If there's one bright spot to the Maroney business, it's that there's so many pedestrian running backs in the league that Maroney doesn't stick out that badly. The problem is, we used a first rounder on him, when a similar back like McGahee could've been had for a song, and guys who are as useful if not better are available in free agency like Sammy Morris, or in later rounds like Brian Westbrook or Frank Gore or so on. Using a first round pick on a running back was the mistake, not drafting Maroney in particular.