Do you find them to be usually wrong in most of the subjects they discuss?

I also have several posters whom I have mentally labeled as both "generally smart" and "holds some unbelievably stupid ideas" - including even a couple of the Top Contributors - but the second label applies only in one or a few specific areas for each such poster, so I tend to believe that they are showing the consequences of one particular bias or preconception on a particular subject, rather than something being unusually wrong with their general mental processes.