Side story, I stood up out of a crowd at a Comic Con and asked him how in the heck Spider Man beats the X-Men in the first Secret Wars.
You know, I still own that book. It was one of the only Super Hero comics I read as a kid who was more into GI-JOE, Transformers, & RoboTech.
I think the X-Men were asking themselves the same question.
And it pretty much came down to Speed, Surprise, & Spider Sense, and the fact that he hit Xavier first & then was mostly evading to escape.
A prolonged combat would have seen him go down & Xavier mind-wiped him just as he was getting away, so in the end, he didn't really win, just had a nice surprise attack.
Finally, since he fights crooks I think they really underestimate how strong & fast he really is.
Well, some can be left out really . . . IM1, both Captain America, GotG 1, and of course the Avengers 3 movies and you should have it.
I'd say even more CW.
I've had several people ask me that recently as Non-fans, what they HAVE to see to follow Avengers-3 & 4.
I really thing only Cap-1 & Avengers-1 are required from Phase-1 since they are the only 1 touching on an Infinity Stone (or the Shield War).
Come Phase-2 its quite a bit more.
Thor-2, Guardians-1, & Avengers-2 for sure.
Cap-2 is also notable for opening up all the drama to come in Avengers-2 & Cap-3
Phase-3 is almost all required.
I think really just Guardians-2 is the only thing you can not watch as nearly every film has some sort of lead in to Avengers-3 at that point.