I didn't really read the thread, so kill me if I repeat a theory.
I think Nihilanth might be one of those aliens that Breen was talking to, a Combine, but modified. Since he has an amazing amount of power, he took over Xen by himself, enslaving aliens and such, The vortigaunts were used...
The combine rocket scene was actually pretty damn realistic. And his arms aren't flailing because of the amount of forward motion he has, just so you people don't complain.
Its really not that great, I played a demo of it.
Mediocre at best, but I suppose multiplayer could be fun.
Maybe if they made it an FPS for PC it would be better, but third person shooters aren't that fun for multiplay.
51% Stuck from sometime in the night.
I deleted the first preload by mistake (it starts around 50%) so it had to go through all of that just to get back up to the 50%s.
Stuckdedness and STEAM go together nicely.