Umm, no one slightly concerned by the chilled out AI base defenders?
If they lack anything in skills (and we don't really know yet, this just one scene and the livestream did talk about AI troops of different abilities and levels) they seem to make it up for it in numbers, as well as skimmer back up.
I get the feeling that if you were on your own and the alarm goes up, you're going to want to be out of there fast. Looks very easy to get pinned down to me.