I've made a preliminary pass through most of the recent stuff pulling out 5 star threads that seemed to fit the bill (threads discussing upcoming WotC products were excluded for example).
The idea is nice, but are we really using the stars rating for threads? Because I got the impression that the vast majority of threads doesn't receive any star ever; then the majority of starred threads have received a rating (usually 5 stars) by a single person; and finally the majority of starred threads which have been starred by more than one person, have been starred by two persons, usually the first person giving 5 stars, and the second person disagreeing and giving 1 star to compensate...
Err, no... In theory it should be one of the most useful thread to be pinned, but in practice it is one year late! The list of links in the first post was last updated April 2016... how can this be called a "best" thread?