Anyone who goes for the extraction point with 20 seconds or less: Fuck. You.
I had to go and revive 2 people outside the extraction point earlier today when they thought it was a great idea to come back when there was only 15 seconds left.
Sitting the extraction point and waiting for a horde to mob on you is a bad strategy imo.
I've always felt it was best to hold two positions just outside of the extraction point then fall back as pressure builds. That way you don't end up with 3 brutes and 2 banshees in your face with a minute left to go.