[quote=@Sep]To start my own discussion, who is your favourtie [i]underrated[/i] villain? Someone that never really grows (but has the potential to do so), or someone that just gets isnta-knocked out. Why are they you're favourite?
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MB and I were talking about Killer Croc last night, and I think the guy definitely gets a bad rep.  Guy used to be a genuine threat, but now he's treated as either a side-arc or a lackey for more important villains.  It doesn't help that nobody can agree on whether he's supposed to be just a buff guy with a skin condition or a full-on kaiju.  For that matter, pretty much all of Batman's "monster" villains get treated like total jobbers these days.

Also, I've said it before, but I think the Atomic Skull should be a much more prominent villain in Superman's lineup, purely on how great his name is.  If it were up to me, he'd have replaced Metallo a long time ago.  "Metallo" sounds like a brand of aluminum siding for your house.  "Superman Versus The Atomic Skull," on the other hand, that sounds like the main event of Wrestlemania.