Although I haven't been going for too long, all the professors I have had have been great. I measure my class quality by the quality of my professor.
One professor I had "wasn't about" the grades. He believed we'd do our best, he'd give us good grades, and if we didn't truly deserve them, we would know it. It was his way of both respecting us and gaining respect. I think I wasn't alone in feeling very comfortable in my classroom environment that term. I still worked hard in that class, trust me, but I feel like it was still an easy A.
Another professor I had was kind and very non-judgemental, which we were all grateful for, since we were trying to learn a foreign language, and pronunciation was difficult. She had a lot to cover for that class and taught us efficiently but not overwhelming ly.