See that last joke by Paul.... that's the thing? If you're Gonna make a game/movie that has a retarded, cliched story with zero innovation and squeezes all of its entertainment value from ridiculous but fun features like Rocket Knees: Why NOT go all out?
Why not have Russians carve the Moon into a Giant Stalin Head with Laser Eyes, which is attacked by a Giant "pointing Uncle Sam"-shaped Spaceship carrying a DARPA suit with built in Rocket knees, "Grenade Launcher" Launchers and Nuclear-powered Baseball Bats? Why not?