These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Badass Decay: Many Flashman fans felt the protagonist suffered from this in later entries, engaging (however reluctantly) in outright heroic actions, for instance saving the British army in Flashman and the Mountain of Light, while downplaying his roguish side. Fraser told Christopher Hitchens that he deliberately amped upFlashman's nastiness in Flashman on the March to assuage such criticisms.
Broken Base: Is the movie version of Royal Flash a funny comedy that makes acceptable deviations from the source material? Or a wretched bastardization of Flashman's character, replacing his wit and sarcasm with overwrought slapstick? Both sides at least concur Malcolm McDowell was less-than-ideal casting (McDowell himself agrees).
For the books: is Flashman and the Tiger (the 11th book, a collection of three short novellas) an enjoyable deviation from formula, or the series's Jump the Shark moment? The third story's Sherlock Holmes cameo in particular is considered either brilliant or inexcusable, with little middle ground.