I recently understood what was it that made me quit reading Dilbert: because he's an asshole now.
For me, Dilbert used to be like a character in a Kafka novel making funny remarks about all the nonsense. And he used to build things too. Nowadays the "humor" is mostly people insulting each other to their face.
Sucks, though. As you say, it used to be such a great strip.
Not normally, but when you read some of his strips after reading some of his articles you start noticing done of the undertones of what he believes in in them. Especially when Dilbert is interacting with women.