That is mostly the point people complain about, its the conflict of themes, trying to be funny and silly when its supossed to be a tense or darker scene.
+plus the fact that this movie was supposed to be much important with introducing the "next Thanos" didn't move the needle. Plus, too much contrived and convenient plot that just happens because the movie needs to happen.
We seen so far two Kangs in the "main" MCU, in Loki and quantumania, and both of then died in a meh way, the one in quantumania was defeated by ants and one B tier hero, he defintly don't feel like a real threat yet.He and his variants definitely feel like a threat, and I don't think we've seen the last of the exiled Kang the Conqueror depicted in Quantumania, either.
It would be better if he actually won in the movie, like Thanos did previously.