Agreed, I also think it's an interesting topic. I don't think it's specific to Nintendo, it's more about how good the multiplayer is on Mario Kart (and Overwatch and Rocket League to mention some non-Nintendo games). Perhaps the journalists and part of the public didn't like the MP on SFV enough to offset the shit SP and overall package, like they thought "yeah this is cool, but not cool enough to blind me from how little content there is", while Mario Kart made them go HOLY SHIT THIS IS AWESOME I DON'T CARE ABOUT ANYTHING WOO. It's not just about the amount of content, but also the quality in it. If you're going to do just one thing, it better be a damn good thing so people don't notice your lack of versatility.
DOOM being knocked from having a bad MP is kind of poor form on the critics because IMO the campaign is so ridiculously fun that I'd be pretty okay if it went the Wolfenstein route and didn't even have a MP mode. And in fact TNO was criticized for lacking MP, but that to me is not a bias towards Nintendo (or Blizzard or Psyonix) and just people expecting a shooter to be have that mode because of the expectations set by Call of Duty. That's one of many reasons I'm really not a fan of current gaming journalism. While I wouldn't call them biased, some reviewers can be at times a bit mindless with their criticism.
