The movie could still be good, but that trailer was so underwhelming in comparisons to Star Wars or Civil War. A good trailer is definitely more than just showing you a lot of cool scenes from the movie, and that's what this felt like.
I'm sure a lot of people will be annoyed they showed Doomsday, the image of all 3 teaming up, etc., but oh well I kind of expected that at this point.
I did like the Kent and Wayne interactions, I'm still undecided if I like the Lex Luthor approach so far, and I'm still worried that it's Zach Snyder... but there were a lot of cool moments in the trailer. That's kind of just my concern.. like Man of Steel, there will be a lot of cool moments, positive qualities of the movie, but it won't all come together collectively and be a great movie... but rather just an entertaining/okay one.