(I am also tempted to cancel my Wall Street Journal subscription when I accidentally read an opinion column. Not sure why real journalists let partisan hacks put their opinion columns right next to their real work. Strange business model!)
When the WSJ rep asked me why I was canceling, one of the reasons I gave was how bad the op-ed section is. A little while ago the news room writers actually put together an open letter complaining about the lack of accuracy in the op-ed section, and also asking for the labeling on the op-eds to be more clear, because it was affecting the news rooms' credibility.
Both newspaper's opinion sections are complete garbage. I tend to agree with the NYT's opinion columnists more than the WSJ's, but I wouldn't say the pieces are well-reasoned, that they try to explain both sides of the issue, etc. It's basically long-form Twitter, which I would pay extra to opt out of.