So, in my 1v1 placement match, I drone-rush a Protoss on Antiga Shipyard (A matchup I hate, and a map I despise, this was before they locked cross spawns... why the hell not?). I win. And I get demoted to Rock-bottom Gold.
In my 2v2 placement match, I tried to snipe one of my favorite streamers (NOT stream cheat, I don't go that far) that I happen to be a mod in their chat for, a masters cannon rusher doing 2v2's with a friend of his... me being a glutton for punishment and such :p
I wasn't able to snipe him, so I quit the placement match. My partner loses. And I get promoted to Diamond.
So, in 2 matchups where I have basically the same MMR, I get demoted when I win a game, and promoted when I lose a game. If I may ask, what the hell kind of logic is that?