Johnny Novgorod said:
Well, it made like $30 million on Thursday. No Marvel movie ever earned that much on previews alone. I think it's gonna do fine.
That's a pretty broad assumption. Thursday previews were always going to be huge because DC fans have waited literal decades for this to happen. I actually don't think we're going to have a fair idea of how it's going to do until next weekend, once most people that decided long ago to see it do so, and then we see about return business and whether the general public are interested.
For the record, the Thursday figure for BvS was $27.7 mill, and Age of Ultron did $27.6 mill before ultimately performing below expectations. That said, DC would be very happy with AoU's box office, but Marvel already had the trust of the general public, and a huge $240 mill from China where there were many previous Marvel movies to support it.