well as for Forman I don't agree with you at all who did he lose too that was shit ? The Briggs fight he clearly won and got robbed, Holyfield is an all time great who was undefeated when they met, Morrison was also looked at as a very promising talent think he only had been beat 1 time before facing Forman. Ali well some rate his as the best ever and there was another defeat he had can even remember the guys name but I think he was pretty average to be honest.
As for Robinson I'll be honest I've not seen all his fights although I've seen a lot and didn't know a lot of the fighters he faced but he did look like a phenomenal talent, probably the most complete package fighter I've seen, from what I've seen he looked as if he had it all.