ASIDE from the DMG or Snowball in this META..!!
TL:DR: MMR is not the only intervention in ranked games from Riots, They have a smart system, which manage to make you a loss if you are having a winning streak, THAT NOT RELATED TO MMR.
Reason? Why? To make every possible way for bad players to climb / love the game / it is more money at the end nah?
Now the possible ways of Riot's intervention are.. (You) ---> (someone is having a winning streak)
- putting (you) with players that didn't play since 1 year+ (Same MMR)
- putting (you) with players having lagg / delay ping (Same MMR)
- putting (you) with premades that having a bad history of try hard (Same MMR)
This is Exactly why MMR is Too short, And Tons of people are around 1400~1600.
[sg-ahri-2]
Edit: i cannot guarantee that its 100% true, it just feels that way to me and the only logical reason that a buff for bad players ^_^ have a nice day.