tried joining a clan? if you want to play seriously and avoid the noobs, then joining a clan could be the answer.
or wether its team games / one v one duel etc.. then go to the www.teamwarfare.com
it hosts a number of different games, with leagues for all of them.
but jk2 is almost dead, there are very few skilled individuals who play and are not in a clan, and there is only about 30 popular servers...
it is also the 2nd most unplayed game on the above website.
but if you are interested in playing, then sign up on the TWL ^.