I haven't seen all of them, but I agreed with the ones I've seen. As much as I hate to say it, I even agreed with the Superman v. Goku one. >_< I don't like the way they did Link v. Cloud but I can't say for certain who I think would win.

I was pretty sure Kirby would just eat everything Majin Buu threw at him. I do think that Kirby has the brute to hurt and speed to keep up with Buu.