Dingbatt: My wife is in no way a Marvel Universe fan but enjoyed the movie as a stand alone piece of entertainment. So a backstory not essential but does allow you to pick up more in the subtext. A working knowledge of the Aussie movie "The Castle" will also bring a laugh or two.
Yep, Thor Ragnarok was good - I'd give it 7/10. Couple of references to backstories, but nothing that was essential.
Did pick up the refernce to The Castle - I re-watched The Castle on the weekend. Not as funny as first time round. Probably a bit dated.
Co-incidentally, the music was done by Mark Mothersbaugh, of Devo fame, and I was listening to a bit of Devo - Freedom Of Choice Live Album, on the morning that I went to see Thor.