Do you even have to ask? He is the most visually impressive villain EVER. My blood races when he's onscreen.
I have read better villains (drow are absolutely nasty), but I have never seen one that looked so good...and lets face it, the prequels are all about the look.
Even if they made a movie about the drow, they wouldn't look as good as Maul.
I've come to accept that Maul's ego was his downfall. His death pi$$ed me off at first, but it now seems like one of the few things that makes sense in the story. Obi-Wan eventually becomes a Jedi legend so who better to have taken him out?
It just sucks that Maul and Qui-Gon were the two best things about Ep 1 and they friggin died.