More the merrier! I think I bought Arma2 on a Steam sale solely so I could play the zombie mod that was going around (DayZ?). Sadly my laptop at the time decided that was a good point to shuffle off to the slag heap in the sky and I never really played it again.
I've just been playing Rocket League (football with cars) at my PC and whilst it's a stupid amount of fun it did make me a little sad as I only really know console gamers, said without judgement as I own a few myself, and therefore have to keep playing alongside a number of random people. Still...