Because Valve is pretty much best game developer ever, they just gave out a huge free update AND they are letting anyone and everyone play TF2 free over the weekend. It's pretty much the most eqsquisitely balanced FPS I've ever played, it's multibounds and exponentitudes better than that CoD4 garbbleage. Check it out, then buy it in the orange box. No excuses, everyone should and will enjoy it. Make sure to trade steam ID's so you can dominate each other, we even have an AA community page. Enjoy!
http://steamgames.com/tf2/heavy/
http://steamcommunity.com/groups/welovealizee