I saw Civil War at an early screening on Friday in Los Angeles.
I signed an NDA so I can't divulge any spoilers, but in a nutshell: The film is very good. It might be my favorite Marvel Studios film, although right now it is neck and neck with Winter Soldier. This film is a tad overstuffed, so anyone complaining about Dawn of Justice being overstuffed and saying Civil War isn't is lying, and it lacks the clear narrative focus of Winter Soldier but that's honestly not a huge problem by any means. The film is so fun (although a bit darker than the trailers suggest) and the action is so truly spectacular that you forget about any narrative problems the film might have as a result of having so many characters and plotlines.
Spider-Man also steals the show. Ant-Man was probably my second favorite character in this, which was surprising because I'm not the hugest Ant-Man fan, but I did love his standalone movie and he works even better here. Black Panther is the other standout; he's regal, powerful and a complete badass.
I think what Civil War gets right (and what Dawn of Justice got inherently wrong) is that you don't want to see these guys fight. The ending is emotional, intense and a bit of a tear-jerker. You just want them to stop fighting so they can go back to being friends. I never got that feeling from Batman and Superman when they fought in Dawn of Justice, so it absolutely helped that Civil War was working from 8 movies worth of build-up and character interaction. It definitely pays off in the end.