My opinion of Civil War is not as high as that of most of the reviewers. Some of the reviewers are lauding this as the best Marvel movie ever, whereas I consider that overall it is a bit of a step down from The Winter Soldier.
I appreciate what they've tried to do and that they have put it into the real world better, and the action scenes are off the chain. Somehow the dialog lacked a bit of depth, and perhaps didn't have as many memorable quotes as the other major entries in this franchise. The interpersonal relationships were not as engaging. Also, it is tough to make up for a lack of Fury, Hulk and Thor using characters they are still trying to establish.
DGMW: the movie is very good. In terms of what I enjoy in a movie, it was not quite up to previous peaks. That's all I am saying.
Some more spoily comments below:
The major battle presaged by the trailers is all very whizbang but the stakes are lowered significantly by the fact that none of the combatants (with the possible exception of T'Challa, wants to kill or seriously injure any of the others. Rhodes is seriously injured, but only accidentally, by a team-mate. There is a no-holds-barred stoush closer to the end of the film, that partly makes up for this Massively Multiple Marquess of Queensberry bout.
Black Panther and Spider-man's introductions are a little clunky ... but they are getting their own movies.
I found myself trying to improve the dialogue as I watched, adding a bit of sharpness here and there in my head, e.g.
Steve: "Why didn't you mention you were Peggy's niece?"
Sharon: "You couldn't work it out from the last name?"
Steve: "It's a common name. Are you Jay-Z's niece?"
Steve: "We didn't ask for this, Your Highness."
T'Challa: "It's Majesty, now. And I didn't ask for that."
The movie does not end with everything resolved. Looking ahead, there are several movies that are, or could be, tangential to the Avengers dynamic: Doctor Strange, Guardians of the Galaxy 2, Spider-man: Homecoming, Thor: Ragnorok, Black Panther. So I assume much of the dynamics of this film will still be in play at the start of the next Avengers film.
BTW, all the characters consistently pronounce Lagos as Lahgos. It's pronounced Laygos!
Edit: the cuts they used in the movie were not always identical to those in the trailer. In the trailer when Tony says, "So was I", it sounds tender and disappointed. In the film, a different take is used, in which he sounds fierce and vengeful.