I burnt out badly on Avengers 2, which was kind of a pointless slog, but Civil War was better ("I was entertained"). It still didn't fully click with me. Part of it is that the disagreement became a lot more personal rather than ideological. It starts out as an ideological clash (with some interesting things built from the previous movies and from what I understand from the comics), but the arguments are pretty poorly articulated from both sides in a handful of scenes and then it's all about vendettas. CK put more thought behind the accords than the movie did, since they're essentially tossed to the wayside. When the big fight comes around, the sides are not drawn because each individual hero has a clearly delineated, character driven reason for fighting on the side that they're fighting on. They literally bring in dudes for no other reason than extra firepower.
Additionally, I just didn't buy that the conflict would result with any permanent or meaningful consequences, in part because the fight has trouble managing tone (it's quippy and ridiculous but they even comment on pulling punches) and because we know Marvel's next slate of movies so we know no one important is going to die. They'll never do this (until maybe the end), but one of these movies might need a Game of Thrones moment to make it seem like there are actual stakes for these conflicts.
The opening action sequence is pretty terrible visually. I do wish they would get a real action choreographer (like, get the dude who did the Raid movies). The airport sequence was done pretty well, but most of the other action sequences were almost completely forgettable.
I guess I'm still waiting for one of these movies to be something other than pretty good. Cap 2 did different things and was good about not sticking to the stock Marvel formula. Black Panther is going to be directed by Ryan Coogler and I hope he does something different. If it's about establishing Wakanda as a place and about the political climate of that nation and the philosophies of a different culture in the context of this weirdass world, that'd be cool as shit. It doesn't need a boring villain or a dumb setpiece fight finale to do something interesting. As for Spiderman, Tom Holland is really good and they'll hopefully skip the origin story but I do hope they'll make something interesting with him.
Also for the love of God just make Cap and Bucky explicitly gay.