Been watching the MCU movies from the beginning with our 10 year old son and we actually just watched Captain America : First Avenger tonight, it's indeed a great one, never understood why some people dislike it.
Admittedly I'm a sucker for nazi super-science-stuff and this film felt straight out of Wolfenstein New Order so I ate that shit up, plus I really like Hugo Weaving. Shame he didn't want to return.
We're watching Avengers 1 tomorrow with him, his mind's gonna be blown. And mine was kind of blown today when I realized the Black Widow movie contains some stuff that Loki talked about with Widow in Avengers 1...that's some serious continuity nod.