yes, everything said here is good, and valid. yes, this site need some serious policing and moderation. any volounteers? moderation takes time. i am sure if people has the time, they will be offered moderation positions, and hopefully sharecg will become a useful and valued community/utility. ultimately, a tighter format of submission is needed. look at the submission procedure of deviantart, or more relevant, turbosquid.
secondly, it would probably be an idea to "correct" those who abuse copyright. if you see stuff up that you know the posters dont have copyrights for, report them to jacob. its for the best of all concerned.