Where'd good players go

I am Diamond 3, even though I am fighting other diamond players, even though it’s not a new season yet ever since the patch I just get people who try and kill me with an early marine or reaper rush. Then they have no idea what they were doing. The last guys rush succeeded but after I beat him off he just bunkered up with several liberators and tanks until I killed him second attack with some Vikings and a couple battlecruisers.

Did the good players all move to diamond 2? I used to get decent players that had fallen to gold rank.

why would anyone still play this game?

Well, what game are they playing now besides DOTA, which I have no interest in.