Making RPG-style character progression work in a realistic setting—more realistic than, say, Mass Effect or Final Fantasy, for example—always seems like a challenging thing to get right. We're not sure if Obsidian has pulled it off, but if they do, it may bode well for that in limbo Aliens RPG the developer was working on.
Make sure to stick around for the chinstrap bearded bad guy at the end. He looks like the Abe Lincoln of the terrorist underworld. Not something we see enough of. Evil dead presidents, I mean.