About the issue where your game is showing as having deleted DLC's or lost game totally. Go to your Steam app. Go to Steam < Settings < Downloads < Clear Download Cache. This should restart Steam and you should have access to your game & DLCs.
What's the current state of Matchmaking?
In the last month and a half, I have had a lot of trouble with the matchmaking, with upto average waiting time of 3-4 minutes every time I hit join lobby, with the extreme of 15 minutes, after which I quit.trying. This is happening mostly as a survivor in a solo queue. I just want to know what's happening with the matchmaking currently and the update on the new system that was being talked about.