Anyone who expects to get carried probably won't get very far in the raid. Kicking can be a group vote decision though. Everyone in a group gets raid checkpoints currently. If a raid leader invites me and we quit without completing, I can start up the raid by myself from that same checkpoint. Mic's aren't 100% necessary. I've been through successful raids where some people didn't have mics and those who did talked about non-raid stuff. There are controls that can be put on matchmaking. Such as evaluating levels, load outs, etc. Worst case scenario is if you get a matchup with 24-26 players, you can quit out. Best case is Matchmaking is intelligent and groups similar levels together for the most part.