While I loved Thor Ragnarok (the treatment of the movie is refreshingly different and there isn't a dull moment), I feel calling it the greatest movie based on a comic book character is taking it a bit too far - that right solely belongs to The Dark Knight (this is a movie that will stand the test of time).
Thor Ragnarok is nevertheless among the most fun movies from Marvel Studio - though I still wouldn't rate it the most fun - that's an opinion I reserve for the first Guardians of the Galaxy movie - ho boy that was something! This one is close enough though - it would've been better if it had a better storyline (which I think was the weak part of the movie)
Lol you literally listed the exact two movies I was struggling with in my top three. I actually addressed this in the first few paragraphs. I took dark knight out of the argument because it transcends comic book movies.