Some literally just put down my scores on tests/papers. Some just copy-pasted the class description and then gave the grade I got.

Others wrote pages of feedback, not all of which was useful. My name is common enough that I was confused with another student once, including with my grade, so that was fun.

In large 500+ person intro classes, the feedback could never have been meaningful due to class size. In other 10 person classes, the feedback was generally pretty good. Upper division classes were better in term of feedback, broadly.

In practice, it's a bit of a mixed bag and each professor was different and themselves differed over time. Generally it's great though, even years after the events.

When I send in my transcripts, I vainly go over them again, and it's always a welcome exercise. Seeing my growth (good and bad) is so incredibly rewarding. It's very rare to get to be assessed like that in such pivotal years.

Some of those forms are the last communications I will ever have with those people as they have since died. Even if those forms are generally bland, I treasure them, as those people helped me so very much and were generally kind to me. I'm tearing up right now thinking about one professor I never got to say goodbye to (Dearest Reader: this is the universe telling you to email that person you've been meaning to email, FYI).

One last thing: if you are a person that designs websites that happen to accept transcripts, please bump the file limit up from ~25mb. Mine is ~200mb as the official download from the school and I always have to go in an scale down the .pdf to the varying mb limit that the website accepts, none of which are the same limit. Also, it always looks terrible after I scale it back.