I wasn't, it was a good trailer that seemed to encapsulate perfectly what the movie will be about. I especially liked Tony's entrance, his "I was your friend too!" line and his fight against Tag Team Cap and Bucky.
I guess it felt like the typical comic book storyline of "heroes pitted against each other" with all the Greek tragedy undertones to accompany it.
I guess it was tough for me because I like Captain America but I don't feel like he's in the right, at least from that brief clip. That might change, but it left a really sour taste in my mouth.
And that's the beauty of that storyline. It provides us a way to discuss the issue, present our arguments (in a hopefully civil manner) and maybe broaden our horizon.
While Marvel is usually flashy entertainment that doesn't go very deep into social issues this storyline tended to do that because in extension it touched on current real world issues and this is why it was such a controversially discussed storyline (can't remember other Marvel events having such a "public" discussion when it was released, they're usually confined to even more specialized message boards than TBBS).
What they do with it in the movie is anyone's guess but i think we'll get a very good movie out of it that moves and changes the MCU once again (it seems the Avengers and Cap movies are the go to movies to advance the MCU storyline).