The majority aren't commentators, they're cheerleaders.Commentary have gotten better over the years, but it's still f’ed.
I'm not sure if any posters watch NBA or NFL (or any other sport) but they commentate games perfectly. Just a raft of professional commentators talking about the semantics of the game in front of them. No circle-jerking of the 'melbourne glory days' or browny talking about his concussions. No bruce getting off on Dusty's avoidance of tackles.