Honestly, I think the reviews on this movie are incredibly misleading.
If you are a marvel fan, you know that there are a lot of plot lines in most movies. In order to truly enjoy this movie, you need to be able to follow multiple plot lines. It is as simple as that. The plot lines add action, suspense, and interest to the movie. Most importantly, the plot lines didn't fall flat. I honestly seriously recommend watching this move. It was one of the best I've seen in a while and an overall great experience.