Glenn Yeffeth, ed., Seven Season of Buffy: Science Fiction and Fantasy Writers Discuss Their Favorite Television Show.
This collection of twenty-two essays begins with some degree of promise, examining certain aspects of Buffy. In particular, Nancy Holder's "Slayers of the Last Arc," is a piece that argues that the final conclusion of the show works well both artistically and in the context of the show as a whole. While I'm more tempted by its seductive appeal to Joseph Campbell's outline of the quest myth (from Hero with a Thousand Faces) as an explanation, it is one of the few pieces that doesn't fall into the trap that most of the rest do. That is to say, it has a clear argument and it doesn't just follow a story--it uses quotations from the show to argue a point. It's a real essay!
The other extreme--and I won't pick on a particular author or essay, here, are the pieces that say, wasn't Buffy great? Don't you miss it when X happened? Who really was Buffy's best boyfriend?
So. Some decent essays, some crap. Much like those essays that you'll find online--and in short, spend your time looking for interesting pieces there; unless you can get this Yeffeth book from the library, it's not worth the price of purchase.