I'm usually online between 5:30 p.m. and 8 p.m.
GMT. That's 7:30 - 10 p.m. CEST (Central European Summer Time) and 6:30-9 p.m. BST (British Summer Time). That's a time where many Europeans are playing. But for GOG's AvP this means that there are 3-5 hosted games with about 15-20 players total :/
I usually host a deathmatch (I love it simple. It moves? Shoot it!) and we're between 4 and 6 players most of the time. If nothing unexpected happens, I'll be online this evening and try the Marine. Join "Hammertime" deathmatch if you want to see me running around while trying to remember how to play as a human. Tried the Alien on the first day and immediately felt familiar with the constant change of up and down. Tried the Predator the other evening and felt like a half god when my only enemies where Marines. Got my ass whipped when Predators and Aliens joined the battle (Predator has overpowered lock-on weapons, but they need the correct vision mode for every species - got heavily confused there).