I mean, the problem is that if they rated games extremely exclusively like some people want, then how do you compare them to games later on? So take a great game from ten years ago and give it a ten out of ten. But what about now ten years later? Is it still worth that? I mean, how could it be, games have advanced so far. If you made a game exactly like that game ten years ago today, it wouldn't get a ten out of ten. How could it? Graphics, gameplay, voice acting, storylines, cutscenes, all of this type of stuff has progressed since ten years ago. So how could you possibly say that that game ten years ago deserves a ten out of ten, or even a nine out of ten if you're one of those "no ten exists" people.
Wait, what's that? The game was fantastic for it's time? Given what it was working with, and what it was competing against, it was near perfect? It was, the best at what it did relative to a lot of factors.
If they rate games they way they do now, it does kind of devalue the system of rating games, but it makes it easier to tell what good games will be if you're looking to buy a new game right now. I mean, give a kid who didn't grow up with your old games the choice of your old game, or a new game. your old game they rated a nine back when it was almost impossible to get that rating, or a new game that they gave a nine or ten "undeservingly" The kid is going to pick the new game, because your old games suck. Face it. They were great for you because you grew up on them, but when it comes down to it, old games just aren't as good as new games, and will never be. They are great to you because you saw what it was, what games were when it came out. You still rate the game a ten because it was the best at what it did given it's circumstances. Ten years from now, new games won't stand up either, except to people that were gaming when they came out.
This is all ignoring the fact that people like different things in their games. So while you may value one thing highly, other might not, and while you hated this feature, someone else could have loved it.