A simple story flow without matching the movie's title <Multiverse of Madness>
(Minor spoilers ahead)
Marvel do want to introducing the concept of Multiverse to us, even in the movie, they keep mentioning "How much do you know about Multiverse?'. Well, the awkward thing is, they didn't explain much about the multiverse, the movie only involve total Five Universe, which two of them appear on the screen for about few minutes only (one is appeared as in flashback) and has no major affect on the main plot. Beside from the original universe, Dr. Strange was just accidentally fall into the other two universe during fighting, and those other universes have no Madness at all. This movie can be renamed to <Wanda of Madness>, where it really show that Wanda keep her 'reasonable' in this universe, and has no mercy at all in the other unvierse.
Another point is, I think Strange 2 movie is not matching the story after "Wanda Vision". where Wanda did accept the fact of Vision's dead and the children she had in the Westview is just an illusion, and thus, she disabled her power that controlling the Westview town. However, in Strange 2, it showed that she is not ready to accept this fact yet, and she tried to manipulate the truth. The human-made Vision also not showing up at all after Wanda almost destroying some of the universes.
Even the Spiderman: No Way Home had better elaboration of Multiverse. The villains from other universe came here to destroy, make chaos in this universe, and even killed the people you know, the spiderman movie is still some kind of Multiverse of small madness.
I think the "What If" series do show the real and amazing Multiverse to us, but the disappointment thing is that Dr. Strange 2 didn't involve any universe from the "What If" series.