[quote=@Yam I Am]
Hey, my girlfriend loves space lesbians!

Though on a scale of 1-20, just how fucked is Earth supposed to be?
[/quote]

12? 15? Very fucked. The majority of cities have been reduced to piles of rubble. The ones that still stand are abandoned with structural overgrowth. The entire coastline was basically washed away. If you were unlucky enough to live near where a crystal fell, you were effectively turned into crater vapour.

Besides the immediate effect of dropping a bunch of heavy objects, there's also the anomalous weather. Black clouds of crystal dust that jam communications, hazes that block out the sun, things of that order.

Permanent settlement is pretty impossible in its current form. While the mech-aliens aren't plentiful or intelligent enough to be part of an ecosystem or form their own civilization, they tend to be pretty territorial. Any attempt at a large outpost would be stomped out pretty quickly. Basically, think about camping in the woods and a bear just struts along because it thinks you have honey.

In the more pleasant regions, there's still birds, insects, and other small fauna. Not enough time to evolve, but enough for some adaptations.

Basically, it's borked enough that it can't be resettled yet, but still has diversity. Jungles, forests, plains, city ruins, etc. It's not a massive molten slag heap.