Counterstrike.
I played that game nightly for 5, 6 months, and just never got the rhythm of it. If my roommate wasn't sitting next to me, playing it religiously, I would never even have stuck it out for that long. Absolutely, hands down, the most unhelpful community of gamers I have ever met. I tried many different servers, looking for an environment that I could describe as "not poisonous". No request for help ever got anything but ridicule. I'm sure plenty of you guys played it for ages and would disagree about this - I could have just had very shitty luck.