That's not what they're talking about. Of course any given reviewer will have specific tastes, and those tastes will color their impression of a game.

What Dunkey does is deliberately misrepresent games for added effect. That's fine in a comedy video, but in a review, it's not cool to say the least.

Take his video on Octopath Traveler. He makes the complaint that the random encounters and slow pace of turn-based combat take up too much time, holding it in contrast to examples like Halo and Mario where the action is drastically faster. That's a valid point, and he's well within his rights to express that opinion in his review, even if comparing a turn-based RPG to action platformers and first-person shooters is a dubious comparison and says much more about his personal tastes than it says about Octopath specifically.

But after that comparison, he says, "Now let's find a level one snail in Octopath Traveler." He then plays a 20-second clip of his character and a snail taking turns hitting each other until the snail dies, and continues, "Now do that fifty more times."

In that clip, he has removed all his party members except for one - and seeing his level, he's definitely far enough to have a full party. Octopath also has a mechanic where enemies are weak to certain damage. The screen shows that he's already discovered what snails are weak to, and is deliberately not using that damage type. He goes far out of his way to deal the lowest damage he can, dragging out the combat as much as possible, to make it last that 20 seconds. But to someone who doesn't realize that he's intentionally twisting the game in a way that no typical player would ever experience, they'd watch the video and think, "Wow, he's right, that combat is absolutely glacial. I'm never playing that!"

Playing a game in silly ways for comedic effect is all well and good. But if you're trying to present your opinion as a serious critique, misrepresenting the game like that is downright dishonest. And he does it in just about every video.