the stakes on the marvel movies can never be the same as the ones in DC.
Supes was fighting Zod and his crew, while the avengers in the first movie were fighting aliens that even Black Widow with Hawkeye could take em down in one-on-one hand combat and in the second one robots that were so easy to fuck up that again Black Widow and Hawkeye could fuck em up..
To equate what is at stake with fighting skills and physical strength alone is to take away almost everything that's significant about the story. Did you at any point doubt Superman was going to win against Zod? Of course not. If there is one thing that bores people about Superman it's his sheer and almost absolute physical supremacy and bravery. He is always going to win.
The challenge the Avengers faced was one about becoming a team, to find one small common ground to do one huge thing. The scene between the Hulk and Thor, when the Hulk punched Thor in the middle of the fight against aliens, was as funny as it was telling. In the first part of the movie they fought almost exclusively among themselves.