I loved it. The design work was superb and the direction (especially in that opening fight) really underlined how pedestrian Thor 2 was. Hulk, Banner, Val, Grandmaster, Loki, Korg, Hel - all great.
I agree with Paul about the Strange cameo. It felt like they wrote the bit for the end of his film and had to crowbar it into this.
Also a bit weird that Sif is absent (and thus presumably now dead along with all the Warriors Three).
The end sort of left me in mind of the New Adventures of He-Man, with Starship Eternia, of all things.
Loved the whole scene with the play and its cameos (though I had to look up who was playing Thor - good choice but not someone I’d ever recognise).