My grammar class in college was the single worst class I have ever had, at any level, including the classes where I'd come home and cry because I didn't know what the hell was going on and effort wasn't paying off.
Everyone in the class failed the midterm. The professor went over it point by point in the next three classes. I took good notes and tried hard to comprehend what the hell he was talking about, but didn't. I was lucky, because the final was the midterm all over again, word for word, and I got an A by barfing up my notes without comprehension, giving me a B (on a curve) for the class. That means a lot of us flunked it the second time, too.
Oddly, I consider myself fairly good at grammar, but not a whole lot more advanced than my skills at the time I took that class. To this day, I have no idea what the professor was talking about. The now-Maryn would call him on it.
Maryn, derailing--do carry on!