Noticed that games like Mario Kart Wii and Metal Gear Solid 4 have a VGChartz score based on presentation, gameplay, and value.  

Are there any plans to implement a user based score where VGC members can rate a game?  

Also, who rates the games and assigns the VGChartz score?

These scores are the overview of reviews written by the staff. These reviews have been coming up for a while, but they have now been linked to the game pages themselves.

The ratings are made by any site staff member who has the ability and desire to write a decent review, and then it is checked over for grammar and content to make sure that the scores and contents are reasonable.

The site use to have this but it pretty much went the way of every other site that has user ratings.  Most people that rated a game rated the game a 1 or a 10 regardless if they had played it or even liked it.  If they hated Sony, MGS4 got a 1.  If Mario was evil, Super Mario Galaxy got a 1.  If you're a Nintendo person, Zelda got a 10 and so on.

After that, you then have person after person bitching about the user scores and how games that should be rated high are too low and it's just turns into a giant annoyance.

In the end, it was easier to just get rid of it.

User ratings were a joke on this site, they caused more controversy then they were worth.

That's for sure.

That's sucks, too bad people can't be mature enough to set an actual score.

user scores were like the hits on game pages. 700k people have not visted the MGS4 page. It is probably closer to 70k, and 630k fake hits (rough guess based on other games hit levels). You can actually find relics of the user scores if you look hard enough. Also, there used to be user reviews, but those got tossed too because people are asses.

people need to grow up lol

What about linking the site users average rating for a game to the 'I own this game' feature, and only then being able to rate the game.

Sure someone that owns a PS3 could pretend to own another console and rate a Wii/Xbox360 game 1/10 (or vice versa) but it would look pretty strange for a user that is always slagging X console off to then say they own it and then rate a game on it.

I think this is an American kind of thing If I remember correctly most American sites give scores out of ten while Europeans seem to like it better to give a game a score from 1 to 100.

Personally, I would like to write reviews without scores as well, but scores make it easier for sites to be considered viable review sources by publishers (which means more reviewers copies in the end).