OK First. Hulk is not a match for Thor in the comics, never was. In fact Thor was brought into Marvel to be far more powerful than the Hulk. Hulk fans for some reason especially couldn't stand the idea of Thor being more powerful. But his strength is equal to stronger depending on the Hulk's state at the time, he was more durable, and has Infinitely greater power, Thor is simply a few level Higher than the Hulk.
The "rivalry" you speak of never existed in Thor fans eyes. That is a thing that was invented completely by Hulk fanboys who have always wanted Hulk to be Galactus level. When the guy isn't even on Surfer's level.
Second this is a fighting game, Anyone can beat Anyone. Zero is one of the sickest and most unbeatable characters in the Game, at least in my hands.
Just have fun with the game, buddy.