WB is definitely not angry, that's for sure. At most, they're slightly disappointed, if at all. The movie will be a huge success when it's all said and done. I don't buy all those fudgy marketing budget numbers and billion dollar projection requirements. If the movie cost $250 million to make, it cost $250 million to make, and it's made $420 million in its first weekend.
Believe me, WB will be very very disappointed about this. BvS, along with Fantastic Beasts, was supposed to make this year for the studio. They have just come out of an abysmal 2015 (think Pan, U.N.C.L.E, Jupiter Ascending), and this year was supposed to bring them back to the top. BvS has failed on all accounts.
250M production + 150+ marketing/promotion means total cost (not including ancillary platforms) is ~400M. That requires at least 800M to break even, since Theatres split Box office revenues with studios. In fact, big markets like China take 60% of BO revenues so the studio may need to take in 1B to consider it profitable (also factoring in unreported costs of production; some speculate total cost was more like 500M).
The movie had a 165M+ OW. Thats good. But it doesn't break records, and the outlook is grim. The drop from Friday-Monday is horrifying. Its a record. Worse than Fantastic Four. It means the movie
has no legs. It will struggle to crack 400M total run Domestic.
In China, a crucial market, it debuted way under forecasts, had a bad Friday-Sunday drop, and may struggle to meet the same total run numbers as Ant-Man.
The prospects of the movie getting to 800M, let alone 1B, aren't guaranteed. In fact, they are pretty depressing.
Remember, Warner didn't just want this to break-even. They wanted this to be a massive win. It ended up a dud.