I think if there is a legitimate criticism to make against this "SJW trend" it's similar to one often made against sports journalists. They like to feel like they're contributing to culture beyond their niche so they often tackle political/social topics that catch their fancy. And it rubs their "fans" the wrong way because they go to those people for their take on games or sporting events or what have you, not to hear why Obama should get a sex change in order to defeat Putin in the Ukraine. And when you tie that into something "wrong" with whatever it is they're a fan of (the Milwaukee Bucks, Call of Duty games, etc.) then it's doubly upsetting.
Wannabe Pundits is how Taranto phrases it because it seems like the writers aspire to be "regular" editorialists instead of "sports" or "media" reporters or what have you.
I think some of Kotaku's garbage falls into that possibly by the nature of who is "hired" to write, but say, Klepek or Sessler opining from time to time and tying it to gaming (which Patrick almost always does that I've seen) isn't even close.
Of course, the real problem is that there's no way to avoid this, they come to your house and force you to read articles on subjects you don't like. Quite frankly, I think that should be frowned upon, and maybe even illegal.