Re: Which villain needs an overhaul?
I hate to answer this question vaguely, but in essence almost all of them. By that I mean that it's rare that I can use a villain as is. I usually need to tweak something, even if only in a small way, to make him fit. By the same token, that tweaking is usually the addition or rearrangement of points.
The main reason I do this is because I want at least one thing on the character sheet to be a surprise for those players who are familiar with the villain.
As to which ones specifically need readjusting, I'm not qualified to answer as I rarely disect a villain if I'm not using him (and if I am, then I tweak him, as noted above).
Lastly, I'm with Mitchell in that I miss the duos like Panda & Raccoon, Thunder & Lightning, Radar and Sonar. My favorite villain group of the past was the Ultimates, and I'd love to see a modern incarnation of that group (with Anklyosaur).