Since this has drifted back to Aliens...
The Aliens in MZ were only a few decades ahead of pre-war technology shown in Fallout 3, and New Vegas.
Stasis Pods, existed.
Repulsor Fields, Eyebots do not rely on obvious thrusters like a Mister Handy or Gutsy.
Teleportation, Transportalponder.
Energy Weapons wielded by the Aliens are not significantly better than thier Earthbound counterparts, with the exception of the Alien Blaster.
Genetic tinkering, FEV made Abomination Creation possible.
The obsession with Giddyup Buttercups makes Me think the Aliens are not as advanced as many People seem to think.
I loathe the idea of Aliens versus Humans in a post Apocalypse Fallout Game, but I do not wish to relegate Aliens to a backburner because of it.
I think the Great Beyond being the Mothership after someone pressed the "Big Red button" is a great idea