So here's a few things I've encountered-
-Started a custom game of Lockout Anniversary Slayer Pro FFA, ended up in Team Crazy King
-Checked my career stats while in MM search, both menus then got stuck overlaying each other and I couldn't get out of that
-The few matchmaking games I did play worked perfectly, only to have the game lock at the loading screen after the match every time
-Backing out of MM with a party means your party explodes every. single. time
And the rub is once you're playing the games (customs mostly, at this point) everything is freaking glorious. CE MP is absolutely astounding here. Hopefully they get this stuff sorted out quickly- because goddamn when it works, it works.