I don't know, Marvel movies are becoming boring. With every movie following the same script formula, they're becoming too predictable. Also, even though they have huge budgets, the production is so rushed it looks kinda cheap. Just to give you an example, in that final fight the Avengers are 'killing' those robots and their peaces are falling over their heads and some of them would be seriously injured, like Black Widow and Hawkeye, but they keep going perfectly fine like the peaces were made of paper. It's also widely known that the movie has editing problems, with very confusing scenes like that one with Thor in the 'pool'. I understand why many people prefer this over the first movie, Ultron is a more exciting villain, but the movie is just not really well made.