Caught Thor: The Dark World on TV and watched roughly 60% of it. I think it's valuable from time to time to revisit the poorer MCU movies around the current state of the series.
Yeah, it's bad, probably the weakest movie in the MCU (that I've seen, I've heard some pretty bad things about Eternals). But even the worst offerings of Marvel are still at worst just "blah". There's nothing offensive or objectionable about it, the acting's fine, the music's actually pretty good and it looks fine. But it just feels like a bunch of ideas that on paper sound interesting, yet never come together on screen. The dialogue's super basic and dull, there's way too many side characters, the villains are weak even by Marvel standards despite their cool visual design, the story is the same tripe we were bored to death of already in 2013, and Thor and Jane Foster are perhaps the dullest on-screen pair in the entire MCU. I think one of its biggest problems is that it takes itself way too seriously. If you had the exact same movie but turned the ham factor up to 11, I think it could actually be pretty decent. And it entirely follows that that is what Waititi pretty much did.
At times it's just flat out badly made: there's some weird and awkward editing in places, the CG doesn't look great all the time, and nothing ever feels like it's given its proper emotional weight. The foremost example of the editing is when Thor's mother dies: she has a scuffle with Malekith, whose bodyguard then shows up and stabs her. In the very next shot Thor has shown up out of nowhere and is doing the typical "enraged by grief in slo-mo" thing. Throughout the entire preceding scene we're never given much of an idea where Thor even is in relation to anything else, so when he shows up it's super jarring. The next scene is Thor's mother's burial, yet it feels as bland and emotionally dead as watching paint dry, because we've never known much about her to begin with.
The only bit where the movie gets legit interesting is the final battle, which manages to mostly avoid the Marvel problem of being yet another CGI blowout. It's more of a strange combination of chase scene and slapstick where neither party is in control of the situation as they tumble from world to world. It's the one time where the "convergence of worlds" plot device impacts much of anything. The other thing that stuck out to me about it is that this more serious version of Thor and Asgard does have a certain fantastical grandiosity to it that's mostly lacking in Marvel these days, since it's more about spacefarers, multiverses and cosmic beings.