Anyone know how the new rating system works?

Super Fantastic - Summoner Stats - League of Legends
Super Fantastic / Platinum 1 0LP / 128W 120L Win Ratio 52% / Draven - 17W 8L Win Ratio 68%, Vel'Koz - 11W 8L Win Ratio 58%, Vi - 7W 9L Win Ratio 44%, Jinx - 3W 4L Win Ratio 43%, Morgana - 3W 3L Win Ratio 50%
You get a rating for your game now, getting MVP if you have the highest rating of the winning team or ACE if you have the highest rating of the losing team. What I don't get is why I get MVP so often. And this is not to boast, because if you look at some of these games especially my last soloQ winstreak, there were people that had a MUCH better score, did more damage then me and sometimes even warded better. and Still I get the MVP tag. So what exactly is this rating based on?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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