As far as i know with Riots system You don't get soft reset in normal. If your in Placements you have been reset. I don't know if riot's system uses uncertainty to build matches but a lot of devs chose to do this. If riot does, your Ranked uncertainty is very high, if it trys to group high uncertainty players into a game expect some brutal mismatches.
Uncertainty in MMR systems is represented by the K factor from Elo's rating system and is part of its adjustment formula. If that information is also used to by matchmaker to build games every year you will see a drop in quality of matches for a good # of your games at the start. Once you have as many games as a dev deems relevant your uncertainty will drop and if the game focuses on using that as a valued statistic then should you will see your match quality grow in every situation outside of accidently climbing to high on the ladder. Even matches would be more common or if you had really bad luck your going to be the best player in a match more frequently then if your even or over placed.