I think Zeus is a terrible villain, I didn't even like him in TAS.
TAS is the only redeeming factor about The Clock King; as well as Killer Croc, who I think is extremely lame, and while I think he has potential, Man-Bat has always bothered me in every comic and tv show he's in.
Penguin is cool in the Burton film as well as a handful of comics and TNBA, other than that he fails.
Poison Ivy, I loathe. She's a terrible villain IMO. Calendar Man is annoying as hell, but like Man-Bat, I think potential IS there.