I finally saw ID 2 and it was pretty good, but there was some really lame design and scripting for certain things. The Fighter Jets, and Helicopters(marine 1) were too much based on the real stuff, instead of something you would create after getting technology thousands of years more advanced to build from. Also no mech suits, or at the very least some power armor. The Aliens were in biosuits that made them 9 feet tall, so you are going to need something taking inspiration from captain america(super-soldier serum) and Halo(the Spartan Armor and project). Also too many pilot operated jets in the movie and no drones.