Ah ha ha we've had such different experiences! I disliked the first two Iron Man movies (the first one has grown on me) and I've never been interested in Steve/Bucky. I recently rewatched the first Avengers movie and, although everybody talks about it as fun, I felt like it dragged a ton in the first half and then the second half was all fighting which, eh, I've never been especially interested in although they do make it look pretty at times.

I like Natasha a lot and have enjoyed seeing her shipped with Bucky in fics. I don't know that I would have loved to see that in the movies, and I'm much more of a Bruce fan than a Bucky one, though I did hate they way they brought in the Natasha/Bruce in Age of Ultron.

Also the scripts gave way too much screen time to Thanos' pain.

On this we can definitely agree! Another big reason that IW dragged for me.