Well, first of all. Their horrible knowledge of English and disrespect for any rules at all.
1) They hardly speak English, and when you tell them to stop using translators and learn English instead, they say something like "No! Learn turkish! America is sinking! Turkey become powerful!" (yes, I know that CS2D_TURKEY said the same thing, just pointing it out).
2) Hardly they ever follow rules in any games and don't understand why they are getting banned. See point 1, to know why.
Hackers, hackers, hackers...
Most hackers, at least in CS2D, are from Brazil and Turkey. Why, no one knows. Even them themselves.
Hostility to everything west of the Eastern Istanbul.
No matter what it's about, Europe and America always sucks, is bad and they say they would nuke us. Why?
As a proof, I stumbled across a link to a nice gaming blog called MAG Journal owned by a simple dude, not a company. Here's what I got:
http://magjournal.net/
Fags has written
Because you voted on the behalf of Israel on Mavi Marmara report as the European Community, we suspended this site
Excuse me, but you have NO right whatsoever to suspend a site that doesn't belong to you.
So, this thread is like the "US, we need to talk" thread.
I hope that none of the Turks reading this are offended, and that those of them who fall under these points will change.