I think this thread and especially this one could serve as a basis for our bottom 20 if such thing ever came to fruition. As some people have pointed it, marketing it as our “official bottom 20” wouldn’t be very representative of the genre, but I believe we could present it as an easter egg of sorts and then it could definitely work as a curio. We could put some kind of hidden button on the Top 20 page which upon being pressed, would redirect visitors to the nether regions of the genre i.e. the Bottom 20. 
I believe every person should be allowed to post only their five most hated spaghettis. In this way, we would whittle down the number of less obvious contenders and we could then focus specifically on the real turkeys. The bottom 20 would make a lot more sense then IMHO.