Captain America: Civil War

Well, that was about nine million times more fun than the comics event of the same name.

They certainly could have billed this as Avengers 3, but in the end I'm glad they didn't, as it puts the focus on Captain America, and that works for the narrative. (It also gives them a reason to leave out Hulk and Thor, and the film already has plenty of characters. Besides, they would have raised the level of unfortunate property damage even further.)

( Reasons why under the cut. Also spoilers. )