Why did they make it so dull?

Rating: 3/10 (11 May 2019)

I watched the franchise only to know some important twists in plot and to brag with people who are interested in this stuff. However, I missed some parts(because I am not a fan of Marvel).
But... I didn't understand the whole movie... who were the characters who returned to life? what relations did they have to main characters? there are still many questions and it was not so exciting.
so, I didn't enjoy the movie, sorry, Marvel fans.