The next person to assume that you get Science from Aliens without the appropriate Might perk (arguably not the most useful of the existing Virtue trees) gets a negative cookie
@Eji:
Barbarians
force you to expend military resources; they're not an option given the ability to invade and harass on higher difficulties. You posit the interactions with Barbarians r.e. Culture expenditure, etc . . . but dismiss similar interactions with Aliens as "farming".
I agree with you on the scaling; Alien territory is often pointless to seriously excavate in an "optimal" build, but then again Barbs have similar conceptual issues. There is no incentive outside of City-State influence to take down a Barb camp given their ability to respawn in short order.
I mean, there are issues with Aliens. I just wish people would stop pretending Barbarians are some kind of awesome predecessor. They're not.
Then again I still don't get why everyone apparently has passive Aliens in their games. It's like everyone stopped playing before Alien aggression got rebalanced.