During the last fall semester I took Chem 101, and my professor was the worst professor I ever had. He was a nice guy so I feel kind of bad talking bad about him, but he was so bad at explaining things that the whole class never had any idea what was going on. Like, it was as if he knew what he was talking about, but didn't know how to explain things in terms a chem 101 student would understand. And then some guy cheated off me during the first exam and the professor didn't know who cheated off who, so we both had to retake the test (I ended up with a higher grade in the end so thanks I guess). The last test I literally got a 62, but he must have graded on a serious curve because I still ended up with an A.

Other than that I've had mostly good experiences though so can't complain too much.