Although online NWN games are free and fairly plentiful, you can increase the quality of the games you find with a few resources.
Bioware has provided an excellent FREE guild system to help like-minded players/builders/dms find one another via the official NWN site.
Also the web-site Neverwinter Connections provides free game scheduling.
http://www.neverwinterconnections.com/
Cheating is fairly well regulated at the individual game level, but be wary in non-dm'ed games that allow local characters!