I know people are used to Scott being the butt of a hundred jokes and constant laughing through the first two movie. This is a different tone on purpose. This is Ant-Man fighting against a Multiversal threat. How big a bad? He mentions planning on taking down Eternity! And he's ominously cool and collected and supremely confident the whole time. Only when engaged in battle does he get angry, and when he's angry, watch out. He is but one of 1,000,000s of Kangs, and the rest are all afraid of him! People complained about MODOK. MODOK is supposed to look ridiculous. People complained about darkness. THEN STOP WATCHING PIRATED CAMS. There was never a too dark scene in the theatrical version. This is clearly an introduction movie, about the phase five big bad. It did what it is supposed to do. To load it up with laughs would mean an extra hour runtime. The movie showed Scott coming into his own as a fearsome hero! Joining the heavyweight class, instead of being "tic-tac". My guess is the early reviewers may have watched a screener that was darkened on purpose, Disney realizing it would be available on the net before the premier if they gave out a crisp clean copy.
Review of Ant-Man and the Wasp: Quantumania
