Ammo resupply - It's rare that I actually get resupplied when I run over the same weapon type as mine. Tonight when I picked up a resupply I had my pistol out. It froze and I couldn't fire or switch back to my primary until I hit melee.
Mics - When you're in the lobby you can't tell who has a mic. For example, one person in the lobby besides me will have a mic icon next to their name. Everyone talking in the room activates that one players mic icon.
Party chat - We cannot load into multiplayer while in a party or our systems freeze. Also, if we are in a party while playing online, we are more prevalent to freezing it seems.
Killstreaks - After calling in an orbital strike or gunship sometimes your weapon disappears or freezes up. You have to switch to your secondary and back to get things working properly again.
Assassinations - In the beta there was a time I was assassinated. When I respawned my friends said I looked like the girl from the grudge moving around on the ground. On my screen I was running normally. This happened again the other day. I assassinated a guy and I didn't get a kill for it. Next thing you know he's moving all crazy on the ground, hopping around.
Hit detection - I'm unsure about the sniper rifle scope. However, the assault scope and the tech scope seem like they don't work? These scopes have 3x magnification, however the red dot works better at range. Is it supposed to be like this or is that a glitch? You can place the center of the reticule on someone and you will not get a hit. However the red dot works just fine at range and it's not even magnified.