Who doesn't love a good magician? And Mumbo Jumbo is by far one of the coolest (and villainous) magicians the Teen Titans meet during the series. Admittedly, he starts off as a joke, getting beaten by the Titans fairly easily. but, then in my favorite episode of Teen Titans, "Bunny Raven... or... How to Make a Titananimal Disappear", he really got a chance to shine.
For not only did he trap the Teen Titans in his hat (literally), he got to show off just how epic of a magician he is. His powers are not to be trifled with. He can turn humans into animals, summon virtually anything he wants, and adjust his own powers at will.
The only catch is, he can't do his magic without his wand. Destroy that, and he's done for.