I'm not so sure I am willing to single out any of them right now. I agree that some are worse than others but almost without exception they are all awful right now.
It's not so much his awful play that bothers me, it's his attitude. For instance, Zimmerman, Johnson, Kearns, Schneider last year, all play hard every day despite anemic batting averages and I respect that. Those are guys I can root for.