Comment below rating threshold, click here to show it.
MMR is match making rating. What that essentially is, is your elo, but hidden from you. We all understand this yes? Okay. So now that we know that, lets talk about all of these posts about people losing massive amounts of LP as compared to winning a minimal amount.
Your initial placement in divisions was based off of two things:
1) your current elo in pre-season
2) your highest achieved elo in pre-season
With that taken into consideration, then averaged out, Riot came up with a rough basis of where to put you. Because this was a rough integration with a brand new system, there needed to be some movements made on where people "actually" belong.
You dont play games based on your division, you are paired with a team based on your MMR (elo). Just because you are in silver 3, doesnt mean you will play with silver 3's. I've seen posts about people in silver playing with bronzes. That means that your MMR is on par with a bronze player. Therefore, if you were put in Silver 3, but your MMR is 900, then obviously that isnt the place for you. No judgement intended, this is just a for instance.
Now this metaphorical 900 MMR silver player wins a match in the new system, he gets 10 LP. But when he loses, he gets dropped down to silver 4. Why?
The reason is, based on the MMR of each individual player, LP is rewarded accordingly. If you're 900 elo and in silver, lose, of course the system is going to drop you drastically. Its trying to place you amongst players of the same skill.
Now on the flip side of that, some people were placed lower than where their MMR has them at. So when they win, they get a massive LP gain, and when they lose its a minimal loss. Again, thats the system trying to get that player where they need to be.
Does that make more sense guys?
This video explains the entire system in general. Really helps if you're struggling to understand other components about the new ranked system. Not my video, enjoy!