Trust me, I understand you're point. It's a simple one. "Embargoes don't necessarily mean bad reviews. Look at Piranha 3D."
The problem is, you're point isn't reassuring. Read the "fresh" reviews for Piranha 3D. They're favorable because critics thought it was fun to laugh at. The studio embargoed it because they knew full well it was a bad movie by traditional standards; however, they didn't account for the fact that critics are often ironic hipsters who give B-style horror comedies good ratings. It's the same reason Sharknado has an 82%.
So when you say "Embargoes don't necessarily mean bad reviews. Look at Piranha 3D", you're inadvertently indicating that even though the studio may have embargoed this thinking it's a bad movie, many critics might still enjoy it ironically.