Where do I begin :lol
1. Tony Stark is a ****ing idiot and never learns his lesson.
2. Black widow X Bruce Banner came outta nowhere and just feels so forced because there was no development for it.
3. Ultron character is bad, like really bad :wesobi: he isn't threatening in the slightest, he sounds like a wise-cracking evil sidekick who is too sarcastic and makes too many jokes.
4. Giving Hawkeye too many scenes and building up his death only to cop out like pussies.
5. Killing Quicksilver because they wanted shock value even though we barely know anything about him nor had time to connect with him.
6. The "New" Avengers are basically a bunch of people you do not want to see in a superhero group movie.
There is probably more, but can't think of any at the moment. Movie gets a 6 or 7 out of 10 by me, nowhere close to the 1st Avenger movie, but it tried I guess.