It is not MCUs top tier movie like Endgame, NWH but definitely not bad as critics are potraying.
Endgame and NWH were great because all dots were in place by so many previous movies, they just had to connect them. Here the whole concept of multiverse is blank, they are creating the dots- starting from WV, Loki, and now MOM. I think it was pretty good in establishing concepts nice and slow, any fast people would have outright rejected it like Thor 1, 2, dr strange 1.
The horror aspect was true because of the gruesome deaths, it was shocking but necessary if you look at it.
It was a simple to the point movie, not much happening as of now, but when they'll start connecting the dots 2-3 years from now, people know the rest...
Just remember the importance of this line from a bomb movie-
'Whosoever holds this hammer, if he be worthy, shall possess the power of Thor'.
Everyone is gaga over it now.