Favorite ever? Hmm... well, David Brin's Uplift Trilogies were pretty awesome. But the series I've re-read the most is the Harry Potter series.
Day 05 – A book or series you hate
Twilight is too obvious. What a shameful thing for trees to die for. Anyway, other than Twilight, a series I hate? Hmm... *ponders* Oh yes, the Dark Tower series by Steven King. Gods, but that man's writing sucks. I don't know how he became a bestseller. Sure, the movie and series adaptations are pretty good, but his writing style is horrendously boring. I've actually fallen asleep trying to read his books.
Day 06 – Favorite book of your favorite series OR your favorite book of all time
I can't think of a particular book in the Uplift Trilogy I liked best. Besides, it was over a decade ago when I last read it. So I guess I'll go on to the second half. I guess my favorite book of all time is "White Fang" by Jack London, as I've re-read it more times than any other book.
Day 07 – Least favorite plot device employed by way too many books you actually enjoyed otherwise
I can't think of anything offhand.
Original meme post, with all the questions