When I first started researching online, I used Genforum, Ancestry and Scotland's People. The first two were so heavily biased towards researchers from the USA that I rarely found anything of much use - though there were some very helpful people out there. Scotland's People was excellent but I found that when it changed to Talking Scot, it lost something and I hardly ever use it now.
I do post on sites which are for specific areas of interest ( Yahoo groups for Yorkshire Dales, Peterhead etc) but Rootschat is almost always my first choice, knowing that it covers pretty much every aspect of family history research and that, in general, Rootschatters are friendly, helpful and extremely knowledgeable.
I think that it is only fair that new researchers are fully aware of what's available to them -but we know where they will end up!!

Jen