I guess the reason the hate is so baffling to me is that this trailer was a notable departure from the previous two and that was a very pleasant surprise to me. I'm a big DC guy, so I was hyped for this thing from its announcement and I definitely liked the other trailers but I never thought that they would really hype up anyone who disliked Man of Steel, they just seemed like more of the same.
THIS new shit seems like the kind of thing that your DC cinematic universe skeptic would be more intrigued by. Much better dialogue, interesting character interactions, a villain that isn't angry all of the time, Supes and Bats not being 100% serious at all moments. I'm sure all of the above points will be separately quoted, bolded, gif-reaction'd and guffawed at because people have different opinions and thats great. But I am personally much more interested in the film now.