Between Christmas and New Years my 11-year-old decided she wanted to watch the Marvel movies in order so we've been binging those.
We started with the three Tobey Maguire Spider-Man movies. I know they're not canon to the MCU but I recall really liking the first couple so I thought that was a good spot to ease her in. She really liked them too but agreed that the song and dance scene in number 3 was horrible (or totally "cringe" as she put it).
So far we've gotten through:
Captain America: The First Avenger
Captain Marvel - I couldn't find
Howard the Duck anywhere on streaming so we had to skip that one

. I hadn't seen
Captain Marvel yet but really enjoyed it. It also had the best Stan Lee cameo I've ever seen.
Iron Man
The Avengers
Captain America: The Winter Soldier - we just started this one last night and are only about an hour into it. I cannot recall if I had seen this one before.
We skipped
Iron Man 2,
Thor: The Dark World, and
Iron Man 3 since those are pretty bad. We also skipped the Edward Norton Hulk movie as well since that one seems to be only tangentially related to the rest of the MCU but I'd like to go back and watch this one again as I remember enjoying it when it first came out.