Do you really think that Is RHCA good? is a good question that will actually have value for people. The problem I see with most career questions is that ~95% of them are crap like the one you mentioned. Your answer is fine, but the question was junk.. Most career questions poorly written, and frequently highly specific to the single person. They almost always ask for opinions then objective useful questions.
I wouldn't be opposed to a good questions that had broad appeal, but describing a filter that only matches the good and useful questions will be very difficult.
I often see lots of career style questions over on https://www.reddit.com/r/sysadmin. I don't think any of them would make Serverfault better.
I don't want to see questions like the below, but I am almost certain that, if we were more permissive about 'professional' type question, these would account for majority of what we see.
- What should I be when I grow up?
- Am I getting paid enough/how do I get paid more
- How do I get a better job/position?
- What do I do if can't get along with my boss/employee/peer.
Most of the questions that are useful along these lines are being asked over on http://workplace.stackexchange.com/questions