I've shown the trailer to a few people, and it's a pretty consistent comment that they have no idea what's going on in the trailer, and that everything looks so fake.
It would really help if they put just a little emphasis on who the bad guy is so we have some idea of the sense of danger and the immediate threat they face. Don't need to know all the motivations or the whole plot, just a few bullet points on who, what, where and why.
But that scene at the end w/ The Flash really was bad. so if that's the humor we look forward to from the movie... I think it really would have been better if most these characters had their own established movies before the Snyder influence dictated how they look and act.
edit:
Here's another trailer/clip.
https://twitter.com/justiceleaguewb/status/917517782815719424WW trying to look cute, Flash making a joke, and another clip of WW dancing(?)