Brit here that just visited CDMX. It's absolutely similar to a number of the Spanish palaces in feel/design, but also has some unique elements, such as the garden on the top floor. Plenty of signage in English and Spanish, explaining the history of the place too. It's right on the top of the hill, so on a good day you get an amazing view out over the city.

We went on a Saturday, and it was fairly busy, but the park the was absolutely buzzing with locals and generally had a chill party vibe to the whole area.

Ultimately, it depends how interesting you find castles and palaces - personally I love seeing different ones and comparing/contrasting to others I have visited, following the history of the development over time.

I found the castle forgettable, but the nicer areas of Mexico City are exceptionally pleasant. I took to describing it to people as looking and feeling like "the nicest European city you've ever been to"