You fail to understand the point Scooby. I'm not saying all reviewers are that way, but that some are perfectly within their right to be that way. You even show my point "do their best job to judge how the game will appeal to those readers", I find those attempt to be laughable in most cases. I can rate music this way based on say the mix or the dynamic range, but then those are personal tastes just like a control scheme or a array of moves in a platformer. Also if you click on the games and see all the reviews you'd be to find out that games OFTEN have 2 or more point swings. Many games with the best overall scores see this and it's not the same magazines or online publications over and over, it's different ones for different games. The reason why the average out of many might match you is because you might just look at a games quality in the majority others do.
Are you really going to tell people that a game with a 94% overall rating is amazing but you know that the game has boring gameplay, a dead game world, levels that are basically recycled, a horrible leveling system, boring enemies, and no real sense of progression? You might, but I certainly would not be so rude to someone. Would you tell someone that a game also with a 94% overall has a infinite spawn mechanic that once discovered completely ruins the feel? That the action is faked and easily broken? That it's single player amazing short and forced feeling? I wouldn't and I'm a fan of the genre on both of those! Oblivion, Call of Duty 4, and even Mass Effect, the first two with more than one review that is a 2 point swing, the last with reviews all the way to a 4.6 swing! How about Halo 3 with many 2 point swings and some beyond that!
There are ALWAYS out liers and those reviews are perfectly acceptable when they provide valid reasons. It is their JOB to inform you what they thought about the game and you can certainly dislike the gameplay mechanics and be a fan of the genre and others can enjoy them or they can fake it because they "think" that fans of the genre will like it. It's simply incredible that you would argue against this. It's what keeps variety in games going (sorta, variety in games gets worse every day) because some people find certain aspects of a game horrible and others may love it.