First off, what does blowing up planets have to do with fighting? Second, I'm not a comic guru, so I'm going to keep it regular with the characters most of us know about.
.. DBZ are weak physically and have limited durability (they stay getting tired and having to rest and shit or running out of energy). Also, all of the strong blasts take too damn long to hit anyone, and the ones who may get hit because of ego or lack of awareness will wave it off like it's nothing (Hulk, Juggernaut, Thor etc).
You can't tell me DBZ can beat Hulk when Hulk can regenerate and gets stronger the more you hit him or the more angry he gets. Eventually those DBZ guys will tire out and Hulk will just smash them into dust. Tbh I'm not even sure they can hurt Hulk.
And everyone who knows anything knows Thor will get busy against everyone besides those super reality bending cosmic beings, he's basically the total package... quick, fast, strong, durable, crazy weapon skills-magic etc.
Btw what about Professor X, Loki and them? Wouldn't they just mind rape them or scramble their brains the minute they stepped foot in the marvel universe. Yeah, the ones voting for DBZ aren't thinking this through at all.
T/S should have picked a specific 2 marvel characters to go against the 2 DBZ guys. Because them taking on the marvel UNIVERSE is silly at best.