Ehn. It's not so much that I dislike it, per se -- I appreciate the artistry and skill involved, t'be honest, to the extent that can be considered "liking it" -- it's that examinatory art (going by your categorizations and making up a word in the process) of a negative nature hit diminishing returns for me... more than a decade ago. It's basically stopped having any messages or revelations of the world that I haven't seen before (multiple times, to the point of literal nausea a few times). Now it's just... tiring, mostly. My jimmies are no longer rustled by such things, and I could stand without the reminders involved.
I still appreciate the artistic aspect of it, but the beauty only connects in a very distant (and frankly unpleasant to me, in a similar manner that I can comprehend appreciation for guro but it's generally a massive negative point) manner and the examination's pointless from my side of the work. So I avoid unless there's something else exemplary (Like, I dig Franken Fran, going by that same line of thought) about the media in question, yeah.
Like I said, a downer ending or depressive events in general are a negative to me. S'not that it's wrong in any meaningful sense, just that its presence makes me more likely to avoid a particular work. I can still be attracted to a game or elsewise when it's got notable or heavy negative themes, it just takes some compensation from other aspects of it to draw me.
Going by what Salmon mentioned, I'm basically the inversion of what he was talking about, heh. I got sick of unhappy endings and downer themes in general, due largely to (the same sort of) overexposure (SG was referencing). I'm a lot more mellow about it nowadays, but a ways back having to slam my head into that shit for a few years straight almost caused me to drop out of school (did cause me to drop a lit class), and did cause a couple of fairly strong depressive breaks. I got tired of it, yeah.