It's too hard to give an exact number without knowing what level of epic this movie is going to be. If it's a solid movie with some decent action and a good story it'll land somewhere between 70%-78%. If it's a movie that makes you leave with goosebumps because of the action, shows a lot of heart and really gives Supes justice, then it'll land between 78%-86%. If it makes the fanboys almost tear up because it's the Superman they've been waiting for all their lives. The action is bone chilling. The flying scenes are intense and out of this world (pun very much intended). They do a phenomenal job with Krypton and the backstory/origin of Kal-El. Zod gives Supes a complete beat down in full IMAX 3D action. Lastly, it sets a solid foundation for future MOS movies and potential easter eggs for a JL movie... Then it will land between 86%-94%. Those are the expectations it'll have to meet in order to reach certain benchmarks on Rotten Tomatoes.