I'm late on this, but I do want to throw my 2 cents in on this. I am a mixed on rather if a reviewer should be good at playing games or not because as someone mentioned before, they could unfairly judge the game because they weren't good and I have seen this before with IGN UK's review of Yakuza: Dead Souls where the reviewer, Keza MacDonald, said that the game was unfair and in the moment they showed the footage, it shows the person backing into a corner and getting beaten to death by zombies even though in my experience the game wasn't all that fair and I was able to get myself out of a corner by dodge rolling even though you should never back yourself up in a corner in any zombie game period. At the same time, there have been reviewers who were honest and said "I'm not that good at the game, but I still had fun.", so that's the main reason why I'm so mixed. If I had to choose a side, it would depend on who's doing the review. If it is a one man team who does reviews like Jim Sterling and his site The Jimquisition, then no. If it is a game journalist company who does reviews like Polygon, then yes. With a company, you got multiple people to choose from when doing a review and a review is sort of like a job, the best ones qualified should get it. With a one man team, you got no one else there and since each person has a different skill level with each game, some are good at FPS games and some are not so and because it's only that one person which is why I think for a single person reviewer that it should not matter since it's just one person who will more than likely be just as good or worse than other people and they reviewed the game because they wanted to.
Now looking at the Polygon gameplay and the review. Both the review and gameplay was done by Arthur Geis, he did confirm on Twitter that he was the one who was playing in the footage shown in Polygon's video. While the gameplay footage didn't seem to affect Arthur's review of the game who gave it a 8.5 across the board on all systems nor is that footage used on the site with the review, there is something else to bring up, presentation. Arthur's review was posted on May 18th while the gameplay footage was posted on May 12th, that's a near one week gap between the review and the video. I heard a good point from ReviewTechUSA about this and what he said was this "that video that was being shown on Polygon was supposed to demonstrate the gameplay" "that was to show what the game is like. You were supposed to, in a way, you were not advertising the game because you're reviewing it, but you were supposed to show it to the best of your ability and it really only" "if that was the first reel that I saw of DOOM, I would've been hesitant about buying it. I'm happy that I bought it now, I haven't played much of it admittedly, I haven't had much time, but I think so far the singleplayer campaign is phenomenal, but if I saw Arthur's gameplay on Polygon first I would be like "Ohhh, this looks like the controls are clunky, it looks sloppy"". There are people who do just look at gameplay rather than reviews to determine if they should buy a game, and again Arthur's gameplay for Polygon was uploaded nearly a week before his review went up, there is a 99.9% chance that there were people who thought the game looked poor from that video and for the exact reasons as to ReviewTechUSA said. It also really doesn't help Arthur's gameplay that during E3 2015 when he was playing the game then and had recorded footage of it that he was playing the game much better as was shown from ReviewTechUSA again and even posted by Arthur himself. You could argue the controls had changed a bit, but I 199% doubt that the controls would've be changed so much, especially for an FPS since and is being played just fine now by a large majority of people, that it would make a person who played the game just fine to them playing the game like a derpy horse. Yeah there are some one person or independent places with just a few reviewers who do upload footage of them playing the game and it is terrible, and if during the following they didn't do any of the next few things, then I don't think they should've even showed that footage unless they wanted to show some gameplay, but I would probably still think they shouldn't have uploaded them sucking at a game. Had this video been attached to the review and/or released on the same day, at least people would say "He gave the game a good score even though the footage wasn't that great so I'm assume he just sucked at playing, but thought the game was good.", or had this been used on video with the person who's playing impressions on the game, which would be Arthur, and he mentioned the controls and/or commented about his gameplay and he said "Even though it may not look like it, the controls are really good", or had the controls been mentioned in his review and maybe even a comment on how he played, or had he played the game better, or had the video not been uploaded at all and it was just the review it would've all ended a lot better for Arthur, it would've been better for Polygon since that poor gameplay footage would've not been, replaced by better footage on there, or explained or even justified if the controls had a negative comment by the person who was playing them (although there might've still been some criticism from people who thought the controls were better, but at least it would be better on Polygon since the reviewer gave his opinion), and it would be better for consumers who didn't buy the game due to that footage and missed out or didn't buy the game until later because they were misguided that the game had poor controls. Maybe this also would've been better as well if the person who uploaded it wasn't a critic, didn't plan on reviewing the game, and was not part of a company, but something independent runned by one person.