Ok, here's a real bug that is repeating without fail for me. In matchmaking after someone leaves a game and the game goes through the finding new host process and once the game resumes, I cannot sprint and my armor ability is gone. Also, my loadout defaults to the battle rifle premade loadout. This gets fixed if I pick a new loadout and die. But I've lost a hand full of close games now because I was unable to sprint or use armor abilities at a clutch moment. I cannot say for sure, if it occurs in every playlist, but it happens every time in Big Team. This seems to be happening to a lot of people and many just are not noticing it because they die quickly after or just do not have the wherewithal to process what is going wrong.
The reconnecting also causes vehicles and weapons to respawn like in Reach. I always thought this was a glitch and it's frustrating to see this coming up again. I've heard a couple people claim they can force the reconnecting process to happen so they can snag a new vehicle or weapon. Whether or not they were telling the truth I'm not sure, however, I imagine a lot of people are trying it.