The word Monogatari implies a narrative arc. The best examples of the genre are not just a sequence of bathhouse scenes and jealousy skits. They use the harem as a vehicle for world-building.
For those who find themselves in that target audience, it's a must-watch. For everyone else, it's an interesting, if bizarre, footnote in the evolution of the Isekai genre.
: The harem includes elves, beast-girls, and mages. Famous Examples to Check Out