Probably gonna get a lot of flak but..The whole Slade thing in Teen Titans...Got out of hand. First of all he hardly did anything himself (like a couple fights) and the whole..immortal thing was just weird.
To each his own. Personally, I loved what happened with Slade's character. It's easy to remember Teen Titans as a childish comic relief show but looking back, there were some seriously deep and dark storylines too--this was one of them. And Slade throughout the series was consistently menacing and "in control," something I always appreciated.