I am content in the knowledge that he is among the top 5-10 offensive players in the NL. I don't walk around like Marty saying stupid shit like he should hit 50 HR's and drive in 130 every year.
To be clear, I put very little stock in Batting Average as an indicator of offensive prowress, I prefer OPS. I also don't go crazy over Strikeout's, I look at a players Runs Created to tell me how valuable he is, or isn't, to his team. Value Over Replacement(VORP) is also a great indicator.
I started to really get more enjoyment out of baseball when I started to look into sabermetrics and discovered how the traditional triple crown stats(BA, HR, RBI) we have all been indoctrinated with since tee-ball just don't tell much of the story.
If you put the prejudices against K's and BA aside, instead look at OBP% and SLG% which together give you OPS, then you get a completely different picture of Adam Dunn. He's not Pujols and he's never going to be. I would trade him or any Red breathing for more pitching, that said he certainly isn't the waste of space Marty, or many casual fans, makes him out to be.