Gloom 3 was pretty terrible. Same great engine as the previous games but with some poorly drawn home-made graphics which made it look like a PD game knocked up in Dpaint.
http://youtu.be/WMazTlO9Vco
Hillsfar was nothing like any of the other D&D games and I agree was not very good, but I don't think it deserves placement on the Worst Commercial Games ever list for Amiga games.