You seem to be unfamiliar with the reasoning of why later film embargoes exist; this article written by a film critic could help explain:
http://www.huffingtonpost.com/marshall-fine/why-embargo-movie-critics_b_2859089.html
Portion from extended post linked in the critic's article getting more bluntly to the point:
Basically, strong movies tend to get review embargoes lifted earlier than others - it creates early buzz and builds hype, especially nowadays where articles will pop up to alert everyone about the latest blockbuster's early reception. Embargoes that are released the day before or especially the day of (again, especially intended big summer movies) are done so to play down the film's quality, at least in the eyes of the studio execs. How is there a financial benefit from playing down positive reception?