Not being able to make satirical comments about any game-related material would mean nobody could say something like, "Controlling Iron Man feels like fighting Jarvis for control of the suit", or "Storm is as effective as a light breeze"
My understanding is that Digital Foundry type of performance review is fine, but comments on how the control feels laggy or the game is a lower-tier copycat of Overwatch are not okay.
In the context of a game, let's say a clearly outdated graphics engine that everyone can agree on looks very dated. Or game-stopping bugs. Constant crashes. Etc.
What constitutes good graphics is entirely subjective. There are plenty of people who would rather play games explicitly because they look outdated than any photorealistic experience. How buggy a game can be before it is detrimental to the experience is also kinda subjective.