In fact, it was one of the hardest classes I ever took in college (who am I kidding...they were all hard). Adding to the difficulty were two additional factors: the class started at 7AM, and there were five students total in the class.
There was nowhere to hide, and the 85 YO professor could be brutal when you gave a wrong answer. The man forgot more economics than all those pinhead PHDs could ever learn.
I did ok in my upper-level Macro class. Upper-level Micro kicked my ass (and the professor was a prick).
Most of the profs speak English as a second language, poorly. One guy would write formulas on the board with his right hand while following with an eraser in his left.