I hate the new League system, but my complaints are slightly more #firstworldlolproblems than most of yours... My Gold V smurf is constantly matched with Plat V to Gold II players due to high hidden Elo, and I always get made fun of during champ select for it :(
It's a lot harder to be demoted if you have low MMR (Elo), so you can lose a lot of games at 0 LP. I have read that its impossible to be demoted from Gold to Silver or Silver to Bronze as long as you don't Elo decay out of a division.