I've got it and will probably never use anything out of it. So far Tome of Horrors is the only non-WotC creature book that I've gotten any use from.
Of your list above, I like the size comparison and the variants. The lore and hooks were useless to me, and seemed to do nothing but fill space. Unfortunately on the scale of fluff running from twinkie filling to chocolate mousse, it seemed more twinkie.
I appreciate the number of people that really like the book, and I got it from their recommendation. I tend to run a different type of campaign, I guess--the amount of goth-ish stuff doesn't do much for me.
YMMV.