There's only one person with the bad opinions, and he's obviously a troll. Best to ignore him.
But Clayface is definitely one of the worst Batman villains, he's utterly useless and does nothing. Which is weird, because he's a shapeshifter and could easily cause a LOT of trouble for Batman. That's never done well in comics though, for some reason. He's had a very minimal amount of good stories. As in like one or two.
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~Halo Rolling around at the speed of sound.
http://img593.imageshack.us/img593/2417/sonicspeed.jpg