I'll take this a step further to say that my graduate algorithms professor assigned Wikipedia articles as reading. The parent blanket statements are just that: overgeneralizations.
I had a similar experience. My cryptography professor regularly linked to Wikipedia articles in his assignments as the reading to go with the assignment. Honestly, the last time I had a teacher really say something against using Wikipedia was in high school.
My undergrad physics professors didn't exactly assign wikipedia articles, but they did tell us that some articles were useful resources for understanding certain topics. In my experience, the more technical a topic, the more likely the wikipedia article is to be reliable. Probably because there isn't much incentive for someone who isn't an expert to edit it.
