1- Captain America? This is the least "Captain America" if the movies featuring Steve Rogers. It's really much more of an Avengers movie, with a slight focus on Cap. It does a little bit of furthering along of Steve's private life, with the death of Peggy Carter and Steve finally, sort of, getting together with the pretty girl we all knew was Sharon Carter. But even this seemed rushed. The bulk of the character arc for Cap is his unyielding support of childhood friend Bucky Barnes, aka the Winter Soldier.
2- Villain? The villain's plot in this movie is ludicrous! Obviously framing Bucky, leading to harsh controls of the governments over the Avengers, leading to Captain America and Iron Man in a big fight. There's just no way the villain could have known the consequences of his actions, and the final confrontation is way too convenient! Plus, they waste a great comic character name: Zemo. Instead of a great Baron and Nazi leader, he's some ex-military man with no means whatsoever to pull off his plan.
3- Civil War? I didn't read the comics, and though hero-vs-hero conflict has been a Marvel staple, making it into the main conflict of a movie is not a great idea. They'd be better off bringing in the Masters of Evil or some other great villain. The hero conflict in Avengers was about perfect, we don't need more.
1- Vision and Scarlet Witch! The development of these characters, their conflict and obvious attraction, is the most interesting sub=plot of the movie. It's far more interesting than anything that happens with the main character (see above).
2- Spider-Man! Though not much of an intro, the reboot Spidey shows a ton of promise. The only bad thing I have to say is the repeated references to how hot his Aunt is (She IS, of course, but I noticed without being told. Marisa Tomei--call me and we can discuss this in-depth!)
4- Characters! The character arcs for everyone else were also very well done. even folks like Hawkeye who don't appear much. Gi-Ant-Man is probably my favorite.
I'd rate this a very average Marvel movie, Not as good as the other Captain America movies, Iron Man I, or Avengers I. But definitely worth seeing.