The thing that isn't getting mentioned enough in this thread is Dunn's defense. I realize there are plenty of players in the HOF who weren't great defensively, but Adam Dunn took bad defense to an entirely different level. That's one of the reasons I never liked him when he was with the Reds. I'll never forget the article in which he said he spent the entire off-season sitting on his couch eating and playing video games. If he had ever cared enough to work out, diet and get his body in better shape, there's no telling what kind of player he could have been.
He can hit HRs and draw walks, but pretty much everything else about him as a baseball player is a big negative. He could hit 600-650 HRs with 1500+ RBI, and still probably have no chance of getting in the HOF.