What can I say that won't be a spoiler... It's a very fast-paced movie, with lots of action and large-scaled battle scenes. The fate of many characters won't be known until the next Avenger movie? Wait, no, a lot of them are still contractually bound to appear in more Marvel movies, so they can't be gone.
Just...very entertaining. And I'm eagerly waiting for the next one.
One side note: It's must be really constricting to write a screenplay for the MCU, when you have to remember the major plot lines of so many characters.