I have a triple major from Cal with math among them. All I can say is that Berkeley math classes were the most brutal, boring, and demotivating classes that I've ever encountered. For the longest time I tried to suck it up and blame myself. Luckily, since then I've had enough great classes and mentors to realize it really was the department and its professors that made me miserable, and I overcame the massive GPA drop and near-suicidal tendencies that Berkeley Math drove me to.