Jingo is one of the more weighty Discworld books when it comes to its themes, Pratchett often explored a lot of important stuff in these books but Jingo is particularly overt in its exploration of the nature of wars, xenophobia, colonialism, and yes Jingoism. Clue in the title etc. That doesn't mean it's not funny and entertaining still because it absolutely is but right from the outset this book riffs on a partial Falklands War angle.

Personally I preferred the first half of the book, before events moved away from Ankh Morpork, with the furiously introspective Vimes coming to terms with his position distancing him from the day to day operations of the Watch and the City at large, especially when he focuses on not getting to know the immigrant communities of the City. Then there are the rising racial tensions in the city and exploration of the sudden othering of those different to you when conflict arises:

Then the plot moves away from the City as the focus shifts from the build up to conflict into the actual conflict itself and for a while the book kind of becomes this madcap adventure that's something akin to a Carry On film in a way what with the Watch stranded in the desert, the Patrician juggling, Colon mugging, and Nobby essentially infiltrating a Harem. It's quite a tonal shift and although still very enjoyable and very poignant at times it didn't quite feel as interesting or as focused as the initial build up and the outright jingoism being looked at in the earlier part.