and always I meet 1~2 cheater when I joined the server that has under 400 ping. but in these days, even the 400 ping servers have no many people and there is the only servers that have 1000 ping. how do I do ? do I have to sell this game to other kid ? this game is almost failed. there is no people in mulitplayer becuz of cheater and bug

Where do you live?

The servers with 1000 ping don't mean anyhthing. Just join a server that is near where you live even if it syas 1000 ping and your ping should be fine unless your internet svcks.

I see a lot of people playing. See that there is 1000 ping servers, but when I join them, ping in most is 80. No close numbers to 1000 ping. =_=
400ms ping will be some sort of laggy cause our eye can react to something from 0.1sec to 0.3 sec. that means that 400ms ping may be laggy, but not as 600-700-1000. But if you having high over 400 ping in server closest to you then... men your internet is "BAD" =)
Do you updated to 1.4 patch? If not, start LAUNCHER, not main crysis2.exe. O_O
Cheaters is part of every game. COD, CSS, Lineage, Point blank, Stalker. All games had, has, and having cheaters. But measures for their "smartness" are taking their places. }:^#})