Great film!
My main quibble is what Vision was doing during the airport battle. Vision's abilities are far and above pretty much every other Avenger with the possible exception of Scarlet Witch. But, although we saw Scarlet Witch battling others, we didn't see much of Vision. Was he holding back because he felt conflicted about being involved? Or did I somehow just miss most of what he was doing despite his colourful costume? Other than phasing through Giant Man, I don't recall Vision having any major moments in the airport battle.
Otherwise, it all worked pretty well for me. The kiss between Steve and Sharon seemed a little out of place. It was almost like Steve only became interested once he knew that she was related to Peggy, which is a little ... disturbing. If the movie earned a kiss, it should have been between Steve and Bucky before Bucky went back to sleep. Or maybe Steve will awaken Bucky with a kiss like in Sleeping Beauty in a future film.
They also seemed to be pretty hard on Scarlet Witch. At no point do I recall Wanda even mentioning the fact that her brother died and her entire city destroyed in the battle of Sokovia. Not to mentioned her imprisonment at the hands of Baron Strucker. Sure, 11 people died thanks to Crossbones, but she saved hundreds in the marketplace. Not to mention the fact that the Avengers also stopped Crossbones from taking and releasing the biological weapon. I guess they needed to wear Wanda down emotionally to explain her unwillingness to unleash the full extent of her powers when in battle. Otherwise, she'd be a one woman army, even with her limited abilities in the MCU.