I have liked every marvel movie so far, but oh, that was terrible! And not just for a marvel movie but for any movie. The pacing was off, the writing was awful, both dialogue and the story itself. Characters would just flit off and then randomly return. I had no idea how much time had passed between scenes (like at the end when they had a shiny new facility but just found the missing jet). And overall the characters felt...off. Also, why is the guy with an infinity stone in his head 'training' to be an Avenger? He's running off of one of the most powerful things in the universe, I think he's got this.
It felt like Whedon didn't care, even the tag scene felt rushed, like Thanos was in the middle of a conversation we didn't see.
I just didnt like the direction this movie took things, and I worry it will carry over into the other films and mess up the storyline.