It's far from perfect, but Four to Doomsday has a lot to offer viewers.  These early Fifth Doctor stories have a solid foundation for their companions.  They all really have a sense of purpose here and are each pretty entertaining in their own way.  Monarch isn't the most memorable villain but the weirdness of the Persuasion and Enlightenment characters definitely makes up for that a bit.  Overall, while not the best, it is memorable, creative, deeply silly, and, at its core, a true Doctor Who story.