If you're from europe and are looking for a great community, with the chance of getting yourself in to the competitive side of Gears of War 3 - head over to http://www.GowForum.net
It's a great way to find teams, players, scrims, and compete in many different tournaments and competitions. We have one day cups, free agents events, monthly tournaments and much more. There's no reason not to get involved.
Despite what people say, anybody is welcome on the forum so long as you wish to play some form of competitive GOW.
Any skill level, any background.