Before the ACB, for science majors at least, there was the life sciences
loungenook in Hall-Atwater. I remember stumbling back to my dorm after a particularly disastrous test freshman year and tearfully writing “I got a 32 on my Chem exam!”. The next day, I stopped by the blackboard on my way to the lab and it was filled with messages of support, the only one of which I can still remember being “My housemate got a 17…”
I’ve never used it to complain about a class though– I guess this is something like my worst nightmare.