Finally caught this on D+, and I'm with you, only I counted at least 4 movies mashed up in in here. A dark fable about dealing with mortality, a super-hero sit-com like She-Hulk, a Terry Gilliam style fantasy (both scenes with the other gods and Planet Black & White screamed Gilliam to me), and some 80s kids flick (basically any scene with the children of Asgard). And I guess #5, standard Marvel CGI spectacle. So incongruent that there can't help but be tonal whiplash from scene to scene, sometimes multiple times within a scene.
The shame of it is the Gilliam-esque scenes work very, very well. I'd love to see Taika walk away from the Mouse's toys and try something odd and original like Time Bandits or even The Brothers Grimm. Would be a better showcase for his dark sense of humor than this attempt at a buddy cop film as well.