I think I can pull off a fairly evil dumb character, but I lack the skill and game knowledge to try a clever evil character.

Problem is, my version of evil is often just viewed as griefing and/or power gaming. E.g. If I ask you to come rank with me, and you're wearing something I really want I'll probably try and bash you down once I'm done with you, or take the opportunity to smoke you when you're nearly dead.