I am almost 100% sure that my 5 WL games are always against div 1 players. I didn't ask them but I can tell for the way they play, the reading of the games skill moves , etc. And then after the first 5 games, all goes back to normal and I play against the average player.
Last year I never lost a placement match, this year I lost 1 or 2 every WL. You could say I suck, and yes I thought about that. But then last week I played a full WL and went 23-6 after starting 3-2, I know elite 3 is no big deal but it is weird that the placement matches feel as hard as the matches to clutch up elite rankings