I have to admit enjoying the Twilight series of books. I thought the writing was bad (very reminiscent of the type of writing I'd get from the higher 4th graders), and if I were to review it, it wouldn't rank very highly, but I enjoyed it. The first half of the second book is the worst of the whole series, as I recall. I enjoyed The Host as well. I think I liked them because the concepts were intriguing, the writing was not exceedingly painful (at least it was edited, it was just very juvenile), and I tend to enjoy young adult books as a nice "brain candy" type of break anyway. I was, however, annoyed by Bella, and could not figure out why everyone liked this whiny girl. Kristen Stewart, who strikes me as a whiny mess in any movie she's in, was perfectly cast
(for the record, I did not enjoy the movies at all)
I loved the Harry Potter series as well, and I very much enjoyed the Sookie Stackhouse series (as a more adult version of Twilight
, but more readable). I think the thing that all three of those books accomplish well is the escape factor.