I like the action sequences (Although the different suits got misused and the ending could've been even better, showing a greater differentiation between the Armors). I think Guy Pearce and Rebecca Hall did a great job to elevate a terrible story/script. That's all the good on this movie.

The rest of the acting was terrible. Downey Jr was awful because this movie required more than the one note that he nails like few ever (cocky-funny). The script was awful; the pace terrible, with an incredible boring middle of the movie to show "the superhero without the suit", including cheesy acting/dialogue. It looked like an early 90's movie... in 2010's. Also the twist sucked and made a mockery of the little tension the movie could've built.

Last point. Like Age of Ultron, they throw a gazillion of terrible jokes and one-liners and they only work when they refer to Tony and Peppers relationship.

The movie is so bad, that even making almost Avengers movie type of money, it ended Iron Man's franchise movies.