I like stackoverflow a lot. However I am observing that superuser and serverfault are more of a general type of Q&A site in their respective fields. That's based on some of my questions which got closed. You want to ask about CPUs in general, that's fine. You want to ask about XEON vs Opteron, that's too localized or too specific. It seems the two sites are geared more towards newbies or entry level hobbyist.
What annoys me a lot is when Jeff Atwood tells me (happened at least twice now) HOW to ask the question. Basically his new question becomes too broad and too general to fit my need and it becomes a Yahoo Answer type of question for the general public. And I know that type of question will illicit generic answers will I already know about and basically, a waste of time and effort for me.
My direction is that if I have a specific need question, I'll ask it at the proper forum somewhere on the web even if it means I have to search for it, without the prospect of a gang of people voting against me, or someone editing my question to fit the site or someone telling me I don't know how to formalize a question or it's too this or too that. Only I know what I want.