The lack of drop-in multiplayer baffles me. Nothing is more annoying and frustrating than either having to wait around for your friends or having to leave the game entirely to get them into your game. Most of the time you have chests etc. and aren't able to leave immediately without risk of losing progress. It sucks.
This problem was solved in other games in like 2005. I understand that they talked about server issues, and having people drop-in/drop-out all the time, but other games figured it out. I imagine Rare can too.
