I have no idea why I'm posting this here, maybe "What's right and what's wrong", cause in this case alien are pure dumbfuck.
I found an odd but rather amusing way to use grenades, kamikaze.
Yup, it works REALLY well, tested plenty of times on ATCS.
Take a nade, run naked (sprint++) to alien base, stick to a corner, thrown your nade and enjoy.Every single dipshit will run to you, and bam.
One of my best hit is 2 goons, 1 dretch and 1 marauder. Also 1 tyrant and a basilisk. That hurt eh. As people can't team, you have to play rambo, in such a wierd way..
Don't try this at home, here I say.