I have a vague feeling that there is something wrong with this sentence I wrote: "One of the courses I took that year was John Doe's Introduction to Literature." I feel that the following sentences are OK:
"One of the courses I took that year had very difficult exams."
"One of the courses I took that year was taught by John Doe."
"One of the courses I took that year was titled Introduction to Literature."
But the first sentence I gave doesn't sound right. I thought the reason for this might be that when you say something like "One of the courses was x." and "x" defines the course uniquely (like "John Doe's Introduction to Literature" does), there is no way there could be two such courses, and thus "one of them was ..." is bad usage. But I'm not sure this is a valid reason to reject this usage, and I don't know whether this explanation really captures the reason behind my feeling that this usage is wrong, or at least, not ideal.
So my question is: Do you think this usage is indeed less than ideal, and if so, do you think the reason I gave is the right one? (I'm a non-native speaker of English.)