The literal reverse of Altered Tundra's list applies to my genre interest, on both sides even. Medieval Fantasy is pretty much my calling and the source of most of my characters and content. It is the easiest for me to write and a foundation I've built on for many years. Sci-fi comes in second, but only with particular mediums; it can very easily turn me off. The top subgenre I am interested in for that would be cyberpunk. Though I've done very little with the horror genre, I do have a long standing interest.

Conversely, I'm not particularly interested in modern contexts, extremely easy to turn off from modern fantasy, utterly disinterested in school contexts (especially high school, you would probably need to kill me and resurrect me as a mindless zombie to involve me in that genre, or wipe all of my programming and make a new program from scratch) and weary of most implementations of superhero contexts.

For the most recent question, it's hard to tell as I've been rather out of the loop for deciding what has been underappreciated as far as an actual genre. I know fantasy may be over appreciated in all forms, which is ironic given my interest. Perhaps the least usual category I would find fun that's still broad would be the aforementioned horror, where I have an interest in exploring the dwindling psychology of a character when they are exposed to certain situations. Most recently I've been very interested in considering the psychology of a character going through a mind-rending dungeon, filled with classical demons, but also elements that strip their sanity along the way. Essentially, the premise of the first Diablo game.