I strictly can't rely on these scores by a handful. It'll be the audience who will make or break this movie. Age of Ultron made things look slightly bleak. To outgross even that movie at domestic, there should be enough repeat views. But 1 billion is almost guaranteed if things remain consistent. Moreover there is this new theory of DC rabid fans skipping the movie altogether and also working against its audience score as a solidarity move against critics. The whole handful of critics are being considered by DC fanbase as a setup by Disney to create anticipation and the accusation being hurled at it would only intensify all the more.
My bet is that this huge anticipation with early great scores will pay off to benefit the OW to around 180 to 190, but the movie will fall in line with Ultron's multiplier of 2.45 OW or lesser(owing to steep declines depending on word of mouth) making it outgross Caps 2 by a significant margin of 120 to 130 M at domestic and 200-230 M more at foreign, thereby bringing its total cume to 1.1 billion at greater ease.
OW: 185M LTD: 415M
Foreign: 700M
WW: 1.1 B