I think it will do OK. At minimum ~$400 million world wide. If WB can make good money despite putting out weak movies like BvS or Suicide Squad, they should be able to do well with even a poor Wonder Woman movie.
Whether its a good movie or not, I dunno. I liked her in BvS but she didn't change the world either.
I've heard rumblings that its good but that's meaningless. Its already failed the first test of a good movie. I know people don't put a lot of stock in movie reviews but any movie that gets a large number of positive reviews a week before release is often good. It shows that the film company is proud of their product. Bad movies are usually hidden from view until release day.