Sure this has been mentioned, and tbh I didn't really buy it, I almost did, but eh:
http://wiki.worldbeyblade.org/index.php?title=Bump_King
Seriously, before all you HWS kids say Dark Wolf, Poison Serpent, or Storm Capricorn suck, think about this: Dark Wolf's FS is useful in destabilisers, and wolf is a pretty cool CW. Serpent has SW145 (good attack track) and SD (great stamina bottom). Storm Capricorn has Storm, which is dated, but at least it was once useful, Q and M145 can get random KO's every so often.
Bump king had an attack ring that was light and had no attack, just ridiculous recoil, and it would have had attack potential in left spin except... It was right spin locked.
The WD, 6 wide, has always been pretty poor, and the Blade Base? Consider it the equivalent of a sharp tip that was also stuck in right spin and at a particular height. It was never any good for anything.
And the whole bey's theme was some kind of Pumpkin. SO COOL.
Seriously, I don't see how there could be anything worse than the classic Suck Beyblade. Honestly, it's like TT said "Hey, let's design the worst bey we can", and succeeded horribly. It's only good for laughs (consider it this way: losing to Bump King is the worst thing in the world ever).