I suggest to create a top 50 sites inscribed less inspiring
I've thought of doing this many times, but every time I try, I always start having fond memories of even the most banal sites. Beemster Polder perhaps being the best example, I really rather enjoyed my trip there, it was a glorious summer day, I met some friendly locals and got a sense of why it was unique.
Heck, some of my most memorable visits have been to the Struve Geodetic Arc and the Pile Dwellings.
European Palaces are always my bête noire, so I would probably give a list of them for the least inspiring sites, even though I understand they are worthy of a place on the list.
Having said that I would be interested to see what places others aren't so keen on.