I was a bit upset when I first saw the fight. BUT I was sitting in a sports bar and couldn't REALLY see what happened. I've since watched (and re-watched) the end of that fight and I think it was a solid call.
The first elbow ROCKED Shamrock badly. The second elbow KNOCKED HIM OUT! You can see him actually SHUT HIS EYES after the second one. He was then hit with four or five MORE elbows AFTER being knocked out. Dean saw this and made a solid call.
The fans were booing and reacting the EXACT SAME WAY that most in the sports bar were. They couldn't see and were pissed that the fight was over so quick.