Just let me tell you, I really enjoy the game ! Like very much ! I liked Hospital an Campus too, but not to the point of Museum. The theming of doing a museum, send expedition, all the decoration, the liberty to organize the exhibit the way I want... And of course, the funny things, the serious game inside a silly and not serious presentaiton. I enjoy the diversity of theme too, but there is one little thing i wish was more present.
I wish i coud do a "real" art section, and have more "historical" theme. We have a complete prehistorical section, full of fossil and caveman items, so we can do a rreally nice start of civilization part ; for greek/roman, the Moitlantéen (yeah sorry, french here, so i don't know the english name for the Atlantide parody) is good and have actually really nice ruins (even if i wish we had more but that's not really important). The ghost and hunted theme can do some thing for a more Middle Age and XIXe century exhibits (even if it's ghost, not really exhibits and objects), and the fantasy DLC will, I guess, add more medieval looking item (and that's cool... when I'll be able to pay for the DLC), and explorer kit have at least a bit of "precolombian" thing.But history is so... more than that. Clearly, I know we can't have EVERY bit of history covered, and i don't wish that. But like, Egyptian and all the funny things we can do with statues of pharaoh and gods, Sphynx, sarcophagus etc... Asian country with all the variety of design (Indian Taj-mahal and Bollywood parody, China with pagoda and te terracota Army, Japan with samourai and no theatre)... XVII/XVIII century European country, with the big dresses, extravageant wigs, and art... That just some exemples i can think about. I really think it could such a good idea for a DLC map, like, an expedition in a foreign continent were you can find artefact of others civilizations (but not extraterrestrial civilizations, just... regular ones). Like... A Historical Theme.
That could also be the way to had more "art" exxhibit. Painting, sculptures, things I don't really see a lot in Two Point Museum. Maybe I'm alone in thinking that, and, i'll say it again, it's maybe just personal taste. Again, I really enjoy the game, play it a lot, and have a great time discovering everything (and now the new 4.0 museum). That's just my little suggestion.