There are a lot of castles in the Czech Republic, many of them included on the World Heritage List, and it leads to inevitable comparisons once you've visited them all. While I'll discuss the others in their own reviews, my view of Kromeriz Castle is that it's not the most impressive overall - but it does have the most interesting interior of them all.

The decorations in the rooms give a real sense of the grandeur of the castle and its residences. Dozens of mounted animal heads in the games room, a large collection of artworks from the 15th to 18th century (said to be the second best gallery in the whole country after the National Gallery in Prague), and the beautiful library with tens of thousands of books.

As discussed by previous commenters, it's the baroque Pleasure Garden that is the most significant part of this site from the perspective of OUV, but I think the castle is still a very rewarding part of the visit. There's certainly a lot more to see in the castle than the garden (and is a much more pleasant experience on a cold and rainy day). For tourists who don't visit any other Czech castles from this period, I think it will be memorable.

The castle can only be accessed by tour, and it's hard to get details of the tour timings on the website. My advice would be to head to the castle first to find the time and buy the ticket - then, if you have to wait a while, you can use that time to visit the Pleasure Garden and the (free) Castle Garden.