I admittedly was a bit skeptical about Ragnarok at first; I loved Waititi's other films, but I had always envisioned the LOTR/Return of the King style epic finale for Thor's trilogy. So I understand why some people wanted that and were let down at a more light and jokey (and less asgard/mythology heavy) movie.
But Waititi just nailed it so well, the jokes were hysterical, the Kirby influence was beautiful, the characters were all great and loveable (Even Strange got an upgrade from his first film, imo).
Plus, that movie is (low key(or should I say lo-ki)) one of the most continuity rich films Marvel has put out, in the sense of small callbacks and subtle nods to several of the earlier films without it intruding on the main narrative. It's no Civil War where you have to have seen the last 20 movies to understand what was going on, but there are so many callbacks that it really enhances the experience.