Just saw it today in 3D (only because I could go to that screening straight after work), which proved as pointless as usual. The movie itself is definitely best of the Thor movies by a massive margin. I'd say it's about in the same league as Ant-Man: reliably entertaining and funny without feeling too formulaic. Goldblum is just a riot of ham, Blanchett is in full-blast MILF mode and Hulk works great as the comic relief. Perhaps most refreshingly they finally allowed Thor to go God mode on the bad guys instead of just swinging the hammer. He's supposed to be one of the strongest entities in the Marvel canon, and this film we finally got to see that. I'm hoping we can one day see something on the scale of him destroying an entire fleet of spaceships with his lightning powers in the Ultimates. The synth soundtrack when it was used was great. The move to what I would call cosmic fantasy instead of having him just on Earth was the exact right move.
What took me out was how they seemingly expected me to remember what happened in Dark World, one of the MCU's worst films, and I couldn't for the life of me remember. It also has a smattering of the usual phase 3 movies: too many characters given too little screen time and the film expecting us to care, the flippant tone taking away from the more dramatic scenes (though nowhere near as bad as Dr Strange, since this is a full on comedy), an overabundance of CGI (even if perfectly executed), the action feeling toothless and weightless and a general lack of a sense of threat. When Hela sliced Thor's eye off you could at least have had him shriek in pain, maybe crawl around for a moment. LOTR had decapitations, dismemberment, severed heads, impalement, blood and all that jazz with the same PG-13 rating. Just for once, please, let the characters get hurt!
It also bothered me how little they utilized the actual Ragnar?k myth. Well okay, there's Fenris, Surtr and the army of the dead, but it all feels kinda token. In the myth those are all things seeking to destroy Asgard, not conquer it. There seemed to be some reference to the ship made of dead men's nails with Loki's horns appearing from the mist. I could have used a little more apocalyptic imagery with Surtr to give it proper weight. This is after all a setting the audience should be connected with after three movies.