Considering that most of the time, I have no expectations besides basic technical competence for anything that I watch or play save for the expectation that nearly everything is to varying degrees over or under rated due to peoples' excessive enthusiasm for hyperbole, I tend not to be let down or hyped up too often.
On the other hand, if I already know the events or outcome of a story because I saw it play out in another form of media, if the the events in the new adaptation not only aren't superior to the previous form, they aren't even roughly on par with the original telling of the tale, then I can feel a mild twinge of disappointment.
Such was the case with animated movie adaptation of 'The Apocalypse of Devil-Man',specifically the ending. Rather than see things through to their bitter end as in the original manga, Akira/Devil=Man just walks past Ryo/Satan, giving him/her the ultimate snub rather than try to rip him/her limb-from-limb. The big battle the entire series built up towards...and the protagonist literally walks away from it as if it is someone else's problem. Series over with out the slightest hint of resolution.
