He clearly doesn't like the Xbox One or its fans, he ripped Halo 5 to shreds and it's been updated into one of the best multiplayer shooter experiences to date.
Pretty sure he's riding console wars buzz for viewer hits and trying to generate buzz on twitter around his review for monetary gain.
I sincerely hope you're not older than 12 years old because the amount of bullshit you are spewing is making you look like fucking MisterX right now. For reference on some negative PS4 reviews, he gave Killzone Shadow Fall a 6/10 and The Order: 1886 a 4/10. He doesn't have a biased agenda and he doesn't give out bad scores for hits. As others have said, which you promptly ignored, he has also given praise to a ton of Xbox exclusives in the past.
As for positive reviews, more recent big game reviews, he gave Witcher 3 a 10/10 and Fallout 4 an 8/10. Guess hes going negative for hits, you know those positive review videos are really struggling with the 4 million plus views they have. Gotta go negative or bust I guess. Oh his Halo 5 review has over a million less views than those? Holy shit my mind is blown.
Seriously, even if his reviews aren't perfect, he does raise some points and primarily i'd have to say this in particular score is a love it or hate it due to the live action stuff being such a major part of it. If you can get invested in the story, then it's most likely going to score higher on your charts then if you just don't care and just want to get on with the gameplay. In seriousness, get the fuck over yourself and move on. Making baseless claims to justify your opinion as better than someone else when they are factually wrong is just making you look like a grade a jackass.
Also as a final note, enjoy the irony knowing that while you are claiming he gave a negative score for attention, that you are doing your part by having the most posts in this thread.
Good day.