
It's good.
Really, really good.
...I guess I need more than that? Okay, then...
Captain America: Civil War isn't just a sequel to Age of Ultron, although it is that as well; it's also a sequel to The Winter Soldier and The Avengers - even Ant-Man, to an extent. It's the first Marvel movie that seems to really reward - if not outright rely on - knowing who all these guys are, and if you've skipped any of the four movies mentioned above, you might find yourself a little confused.
Especially by Vision.
Having said that, it does a pretty good job of re-establishing who people are and how they relate, without getting bogged down in retreading stuff you already know if you rewatched the lead-up recently.
I'm going to try and avoid spoiling anything, but be warned - if you want to go in blind, all you need to know is this:
It's good.
Really, really good.