Has there been another change to matchmaking recently?

I've noticed this in pubs too over the past week or so. Every game I play, I am right at the right-hand end of the distribution curve. Basically, the flat line. I'm not even a 1 KDR player. However, games like this should be impossible for me but I'm just about holding my own, which indicates to me the curve is garbage and MMR is garbage too.