The trick is to post your problems before leaving. That gives people a chance to come in and try and help out.
This, of course, presumes they came to the support forum in search of support. ...and not merely to post a parting rant/vent/complaint on their way out the door.
I see similar scenarios on the IRC help channel almost every day. They usually go something like this --
07/03/12 13:00:00 NewMintUser: just installed Mint and not working at all. Worse than anything I've ever seen. Nothing works right. If I can't get this straightened out, I'm going to have to go back to Windows.
07/03/12 13:00:10 HelpfulPerson: Which version of Mint are you using? What kind of hardware do you have it installed on? What have you tried that isn't working right? Are you getting any error messages?
07/03/12 13:00:22 NewMintUser: everything's borked. was this supposed to be released like this? who's in charge? I was going to contribute, but not if I can't get anything to work right!!!!!!!!!11111!!!
07/03/12 13:00:31 HelpfulPerson: Which version of Mint are you using? What kind of hardware do you have it installed on? What have you tried that isn't working right? Are you getting any error messages?
07/03/12 13:00:49 NewMintUser: what a bunch of bozos! none of you clowns know anything?? My neighbor's aunt's pastor's gardner was right -- windows is better!! later chumps!!!
NewMintUser has left the channel.