Riots Match making is build to keep you crawling the ladder.
Every time I get promoted I get matched with total crap players for the first 4-5 games and often this makes you drop down again.
Ill go 5/2 mid and my top will be 1/10 and my jungler 0/0/0 by 15m
WHen Im at 95 LP then I start to get good team mates and the game feels good, but once I win my promos its total crap.
Makes me feel Riot built the system to make the climb as frealing slow as possible.