I counted through all the top-level comments with at least 5 upvotes which state a personal opinion on the topic, and there seem to be 15 medical professionals who feel negatively about working in rural areas and 13 who feel positive.

So, if we're using the reddit thread you yourself have presented as evidence of the general sentiment on this topic, I think the parent commenter is correct in arguing that there is no particular universal trend here. These experiences probably have more to do with the simple randomness of where you work and what kind of personality you have.