Here's examples of all the above instances:
1) Jim Sterling gave Sonic Colours a good score, later, he went on to bash it. Sonic's twitter account called him out on it. This applies to those who also criticise one game for doing something, yet reward another for doing the exact same thing...weird.
2) We see this a lot in sequels to games and in the adventure games scene. When asked about a recent adventure game that was released, Greg Miller replied "who cares about adventure games.". Unfortunately for him, quite a lot of people as that's how we've seen the rise of Daedalic software, Telltale, Life is Strange, wadjet eye games, Revolution software, remasters from Double Fine, Dreamfall chapters among many random indie titles.
3) this one speaks for itself really. The big sites like IGN are great at it.
4) If Barry asked me to review a RTS, I'd tell him I couldn't. Why? Because it's a genre I have no interest in or real knowledge about. Yet, over at Rock, Paper, Shotgun, they consistently have a reviewer (walker I think) who reviews adventure games when he doesn't like them. The slight hint of a puzzle that's very logical, but slightly difficult sends him into "awful puzzles" sentence. Some of his reviews even feature outright nonsense.
5) Polygon have consistently been caught on live streams stating they don't like A, B or C and only admitted to receiving cash from MS once caught.
6) The announcement of Shenmue 3 was a brilliant example of this. Sony said on stage they were helping with the marketing...yet, this was a major issue with journalists who seemed to have forgotten this and started making crappy stories up. The funniest of which was Kotaku who was picking fault with the physical release cover art...you, know. The art that was clearly just a mock up and clearly not real.