Suggest me a book! and tell me why you suggested that one (or seventeen).
Genres/authors I like include SciFi (Asimov, Heinlein, Bujold), Fantasy (old Lackey), real-life science dumbed down so I can "get it", historical fiction (as in, "this really happened, but we added some dialog rather than just reporting it"), Horror (Dean Koontz, Stephen King), Medical mysteries (Cook), Regular mysteries (The Cat Who...), classy vampires (like Thorn / Dr. Corday).
IF you can find decently written pagan fiction, PLEASE do tell me about it -- most I've been able to get hold of reads like bad fanfic (yes, you, MRS) and is poorly proofread if at all. Llewyllen publishing has much to answer for.
History / boigraphy / sociology -- depends on the subject and the presentation.
Stuff I don't so much like includes westerns, xtian fiction (Left Behind series, new Roger Elwood stuff), erotica, romance. Anyone who suggests harlequins, et cetera shall be summarily swatted when next we meet.
Yes, I know I used a lowercase h.
There are several series that I started out liking, but as the series grew longer the quality of the writing seemd to suffer. I am only reading Anita Blake now to continue/complete the series, not because I think the later books -- sexfests for the sake of sex -- are as entertaining as the earlier books where the sex actually had a reason / was part of the plot.
The Herald-Mage books, and those set in that world, had the same progression, for me -- writing to have a book on the shelf rather than paying attention to the story.