The forums seem to be a bit more alive than normally so might as well start posting things.
So, I've been pretty hooked up to this one F2P game named Loadout for a year already, even as far as being part of the beta family back then. It's sort of an arena-shooter with high amounts of weapon and character customization, very fast paced combat and very personal art-style (although pretty much everyones first impression of it is that it looks like TF2 because it's cartoony). Extremely fun to play with friends and/or if you get balanced teams, or if you just want to do random stuff and just mess around. I suggest you guys give it a go, it's free so it doesn't cost anything.
A trailer: https://www.youtube.com/watch?v=Ox3CNcdE-Ec