Too much credit is given to how "deep" Marvel plots are. In fact, they're all very simple. There's a bad guy trying to take over the world (or universe), and there's a hero who needs to learn how to beat them - that's it. It might be a nice watch the first time, and there may be minor differences here and there. But overall the basic structure remains the same, and the story each movie tells is far simpler than fans may want to give it credit for.