It's not just more demoralizing, it's more productive.
I've been eviscerated by good friends for this opinion but I had a problem with Sanders dancing behind the line. He put the Lions into long down and distance way too often for me. His balance and agility were beyond compare, no doubt an all-time great talent, just not my top RB for that reason.
I can't go with Jim Brown simply because I never saw him play. By all accounts he's a great choice, maybe the best. OJ is at the top of my list and Earl and Bo get honorable mentions because they were freakishly dominating but I'll go with Sweetness. A remarkable combination of everything you want in a RB. He did it all.