I'm not going to give an unnecessary analysis of this movie or throw in any spoilers. I will say that many of the negative reviews are about "wokeness" (Due to the inclusion of women, minorities, and a lack of male leads) and "confusion" about the plot.
So, I'll start by saying that if you haven't watched WandaVision, Ms. Marvel, or Secret Invasion, you may be confused about how some characters and storylines fit into the movie. If you have watched these shows and are on board with the characters, you'll love it! It was entertaining, just like a movie is supposed to be.
Not every movie needs to be an exhaustive effort of plot, script, and character that only appeases the most dedicated Marvel superfan. If you want to go to the movies to see some good action scenes, laugh a little, and have a good time, go see it!