Well, before AvP2 was announced my list would have been
+Set in the future.
+Set in space or on another planet.
+R-Rating
+Good script
+Predators Actually Win.
+Better Predator designs.
+Good actors. No teenagers.
+More graphic chestburting sequences.
+Good Alien-Predator fight sequences.
+Predalien (If it's done right).
+Movie should be at least 2 hours. No 90 minute film.
+Good Visual Effects.
-No silly team-up.
-No screwing around with predator technology from the first two films - ships, vision modes, weapons etc.
-No continuity problems.
-No Lance Henriksen or actors from previous A/P/AvP films.
-No connections between Predators and Space Jockeys.
-Definitely no PredQueen.
Well, so far at least four of my plusses have been ruled out.