This map is a haven for metagaming and glitch exploitation. Almost every round someone lets an innocent into the traitor room, and people who manage to get there will block the door to let other innocents in.
There's a glitch that occasionally happens that allows you to see through the traitor room door in the basement for the entirety of the map, until a map change. It also allows you to shoot into the traitor room as well, apparently.
And of course this map is chosen incredibly often, to the point that it'll be selected twice in a row on occasion, making matters worse.