Those that knock the 'Busa have: never ridden one, and/or never ridden the competition. They are smooth as silk, reliable as a stone axe, comfortable, roomy, long legged, and all around great bikes, never mind the fact that one twist of the wrist and they'll flatten your eyeballs like no other bike. Oh, and did I mention that they handle and stop pretty good. Beauty is as beauty does.
That's not to say it handles like it's 380lb, 600cc bretheren; no way baby. But it does what it is supposed to, and I've seen some experienced riders hustle them around Summit at some amazing speeds.
As for styling; well, like I said, beauty is as beauty does. I for one care to leave the post-modern-folded-origami-praying mantis school of motorcycle "design" way alone; I like the 'Busa's swoopy gentle curves
I'm a guy who grew up huslting heavy steel-framed sport tourers through the bends...the "Busa is comparatively svelte.