His first victory over Chuck Liddell helped fan the flames of the Pride vs. UFC war.
The UFC bought the World Fighting Alliance so they can acquire Rampages contract and set up a rematch between him and Chuck Liddell.
His second victory over Chuck made him a champion.
After that he defeated Dan Henderson in his first title defense unifying both the Pride and UFC titles.
He became head coach of the Ultimate fighter, won two Knock out of the nights, three fight of the nights, and one fight of the year.
How is that not HOF material?
I'll give the HOF nod based on what is said here, but will agree with most that it is time to go. Guy just doesn't hav the drive and has not for a while. I'd gladly watch him fight again, but on free card. No sale anymore the drive is all gone.