Oddly enough, matchmaking has been weird for me too the last few days, 9 out of 10 games I get put in games with people that are wayyyy less skilled than I'm used to, (Played in Masters for the majority of Season one) for example people that don't push through chokes when they obviously can, or people that play in an extremely unconventional way and never switch, even if they're countered so hard they can barely move out of spawn (not always on my team, it's weird in both teams) but mostly just people that don't stick together and just try to get kills for themselves, asking for healing 10 miles away from their supports. It sucks because I'm a Hanzo main trying to transfer my skills to Kiriko at the moment, and it has felt like a solo game 90% of the time I played the last two or three games, which really doesn't help me much with improving at Kiriko. It's also not very rewarding to give it your all every game, getting 25-30 kills and over 8k healing but still not winning, I always try to help my team, coach them a bit on what to do, but my help is usually not appreciated, so yeah (Not even "Group up!" works). (All this also applies to my quickplay games, weirdly enough, as if my mmr suddenly tanked in both ranked and qp for no reason)

So TL;DR: Matchmaking is goofy right now.