Reading this topic http://forums.spiralknights.com/en/node/46222 brought some attention to my own experiences. After giving it some thought, the game's flawed cooperative connection mechanics became apparent, especially in regards to the various missions. Currently, choosing to join a random party for any mission is undesirable because joining after the mission staging area reduces the rewards. It is almost necessary to have a variety of established connections in your friends list or with guild members to avoid consistently performing missions alone.
I would like to see something like what lockdown uses for matchmaking used for missions as well. This would allow players to search for others to complete missions with while still running around haven. There could be options for the size of the group you want to join and it would also be nice to see the capability to join someone else's search or invite someone to join yours. For example, any player and a friend could search for two others to complete a mission.
If nothing else, there should be an option for joining only at the beginning of a mission to eliminate the fear of wasting energy joining a party too late. Or preferably, the game should always prevent anyone from joining a mission beyond the mission lobby.
-espil
It was stated before that by joining a party, you do so at your own risk.
Honestly there's not a lot in this game that promotes cooperative play, and most people, myself included, go with friends/guildmates only or just solo everything.
~Sev