dang recently pointed me to the HN guidelines. I think this one applies here:

"Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something."

This is by definition a critical comment which teaches something, ie if you don't present viewers with pertinent information about your project, they cannot take an interest in your project. I think it should be noted that both GP and another few highly rated comments are making this exact point.