I'd think Ragnarok doesn't work too well unless you've at least got the gist of several of the other films, like the first two Thors (which... ugh, especially 2

I'd think Ragnarok doesn't work too well unless you've at least got the gist of several of the other films, like the first two Thors (which... ugh, especially 2), probably the first two Avengers, Civil War AKA Avengers 2.5 which in turn drags in the first two Captain America movies (you'd think it should drag in Iron Man 3 too, at least, but they just kinda ignored what happened in that movie for some reason, so it doesn't). Especially lots of the jokes, but also much of the character development. Could be wrong about that.