Killer Bee is actually very good to use. When I first pulled him, I felt the same way, but I have been using him a lot the past few weeks. He is a lot of fun and a good bait for those annoying accupuncture/interrupts. xD
Currently I use him in attack spam teams with Lightning main. In my server he's used in a bunch of different teams though (Water, Wind, and Fire teams). The best place for him right now is with Sage Naruto + Kage Gaara, but I use him without both of them sometimes and it works out fairly well.