Tank will always be great, but he's from the time before it was even called MMA.
At the end of UFC 6, after finishing TWO fighters in a tournament (same night), he went on to fight in the finale for 17+min against a much more well rounded Oleg Taktarov. He lost, but gave a great post fight speech...
When asked if he let his fans down (Tank grabs the mic): "I don't give a shit about them, I was the one in the ring, I got my ass kicked... I let MYSELF down." (I don't remember it word for word, but it was a brutally honest post fight speech, more so than I've ever heard from any athlete.)