Sort of a m.
I'd been meaning to answer Steph's question, and Tim reminded me.
So, here is my list of things that I think are fun in a book. It got long:
1. Loveable rogues, of any species or gender, preferably when it's not clear if they're good or bad guys.
2. Ships--sailing or space.
3. Straightforward dialogue. Manners, for the most part, are boring. (Also, comic dialogue--but not banter. Watching Cary Grant and Rosalind Russell banter is a delight. Reading banter is a chore.)
4. Castles big enough to lose a civilization in (blame Mr. Peake).
5. Unexpected (but believable) reversals.
6. Gods and immortals walking among us (except for American Gods, sorry). Particularly if they're working stiffs. C'mon, who wouldn't like to see Sobek crunching numbers at a CPA's office?
7. Magic grounded in real-world traditions, not hand-wavy D&D crap. (Also, religions--note the plural--which are grounded in things which actually resonate, whether pulled from real traditions or invented out of whole cloth. Really, this one boils down to "Books where the author has done the f&*%ing work.")
8. Misplaced objects of great power, which are subtly different from lost objects of great power. As in, "I could have sworn I set the Orb of Maximus on top of the credenza . . ."
9. Eccentric inventors.
10. Animals that are smarter than the humans (or other dominant life form). They can talk, but only if they don't talk to the humans.
11. Secret histories.
12. Mountains, caves, tunnels, hidden chambers--think the Morlocks of the X-Men, or the underground London in The Anubis Gates.*
I could go on, but better to stop at a dozen, I think.
*Really, Powers--and Blaylock too--have most of this list covered.