And as a result, Joel's writings are a lot more valuable.
I have a personality like Atwood -- if I'm mad about something, I immediately feel the urge to write a scathing and negative blog entry. Every time I do this, though, I get a lot of negative feedback. So, I try to tone down my personality and stick to instructional entires now, and amazingly I get positive feedback every time. Nobody cares what I think... but if they learn something, then my blog is worth reading.
"Show, don't tell." is what they teach in elementary school. It is a very valuable piece of advice. (In this case, I mean "show why foo is good", not "tell the reader that bar is bad". Criticism and snarkiness breads criticism and snarkiness.)