Bad players are L33ter players, cheaters , ebayers and etc.
How will this be controlled?
As for the cheaters, PS has a unique set of programs that are to catch all unnormal behaviour. Mapmodifications and client modifications are very easy to detect as the client needs the server\'s approval for just about everything it does, and so it will be sending lots of malicious data that the anticheat will pick up and report. As for bugs, well... We can only hope the bug finders will report the bugs rather than use them. Or it will just take a while longer to discover who the cheaters are, and ban them. As for cheating in general, try and look at the page called \"Cheating\" on the main site.
The l33ters and ebayers... Well, as long as you\'re not l33t in public and breaking the rules by calling people idiots and whatnot, there\'s not much anyone can do. Names, however, do need to follow the \"Roleplay Only\" rule. And by roleplay only, I mean a REAL name. Not \"GodOfThunder\" or \"SuperAssassin\". Those are nicknames, and they\'re lame. A name generator has been provided to give incompetent players a good name.

As for the ebayers. I don\'t really see them problem with them. If people are willing (and stupid) enough to buy stuff for real money, then I say let them. But that\'s not really up to me. That\'s for Talad to decide.
Will there be instancing like in Guild Wars and EQ2 to give this game single player richness and a tiny bit of privacy?
It\'s a MMORPG. Why do you want single player things?
And what about the use of bots will that be fought?
I\'m not sure of the details on this one, but such things can easily be monitored, and spotting someone who has been playing non-stop for 72 hours (just to make an example) shouldn\'t be too much of a problem.