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.
WTH, Casting Agency?: Often cited by critics. While some portrayals were considered okay or even good, most notably Quevedo (played by veteran actor Juan Echanove) and Alatriste himself, the rest was rather weak. The most bizarre point was having Bocanegra played by a woman, nothing less.
Alatriste (TV series)
Disowned Adaptation: Though Pérez-Reverte spoke unusually well of the series, producer Paolo Vasile and most of the executives of the producer company labelled it as a failure even before his screening.
The main fan uproar comes due to the series removing what they see as the most important element in the books, especifically the relationship between Alatriste and Íñigo. In the books, they are basically father and son, and the boy's loyalty to him is such that his only reason to be a soldier is to follow the captain to Flanders. In the series, however, Íñigo is completely indifferent to Alatriste and only sticks with him in order to become a soldier like his father, while Alatriste only sees him as a annoyance and practically ignores him.
In the series, Angélica receives much more characterization than in any of the books, but only in exchange for turning her character from a quiet yet sultry Mysterious Waif to an almost parodic seductress failure who never gets her way and is more or less tooled by the rest of characters, even Íñigo himself.
The fact that the series contains so much humor despite the books being almost completely devoid of comedy is not better received. Some legitimately badasses characters, like Quevedo or Sebastián Copons, are reduced to Bumbling Sidekick roles just to add Plucky Comic Relief.
The books emphasize the Combat Pragmatist philosophy of the characters, often showing Alatriste's derisive thoughts on show-off opponents and foes who do too much Weapon Twirling and Rule of Cool. Then, in the series, he does exactly that, as the duels are often overtly spectacular or downright bizarrely choreographied (with instances like Quevedo chokeslamming a mook, Alatriste back kicking everybody and beating swordmen while barehanded, and characters doing the occasional Zorro sword trick).
WTH, Casting Agency?: The series is a much, much worse example than the movie. The entire casting has been panned by fans and creators alike, noting that it looks like the casting staff chose the worst actor imaginable for every role. Carmen Sánchez as Angélica was a Base Breaker comparable to the Daniel Craig portrait of James Bond, but Luis Callejo as Luis de Alquézar was considered by many as if Star Wars's Count Dooku had been played by Jack Black, and that is only the iceberg's tip.