Without a doubt a top 10. Most guys here don't remember or weren't into the sport when he was, at the time, rated the top middleweight in the world for good reason. Only Silva really beat him in his prime, otherwise only lost close decisions to Hendo and Forrest, and got finished by roided up Vitor. Had Silva not been around, Rich could have easily put 6-7 title defenses under his belt and been called MW GOAT.
He was one of the most well rounded fighters we'd ever seen, great cardio, good boxing/kicks, knockout power, good wrestling, very good top game, and a decent chin. I think he was a better version of Rockhold, with a higher fight IQ. At one point he was like 24-1, and all were finishes. That is impressive.
Also to come back after the beating he got from Silva took some guts. After that fight he went against Jason Macdonald who was a hot prospect on a good win streak. Rich beat the holy shit out of him. Same as Okami, was on a 4-5 win streak, the next big contender, and Rich outworked him pretty handily.