Yup. Just a mess.
Personally I thought there were some great moments, but overall it felt a lot like the script was disorganized. The scenes didn't really connect to one another, and it felt like the movie really wasted a lot of time either setting up the plot for future movies or adding in way too many details.
Some of the character development was welcome (love me some Hawkeye) but it felt like it came at the expense of the script. Ensemble movies are tough to do, but after the first Avengers film I honestly expected better. That movie set up each character very well without taking up a lot of time.
I know a lot of people liked it. That's cool. It's just never going to be my favorite Marvel movie.