Negative Positive
Title: Okay book, but too short.
Review: Vortex of Madness is interesting, but weak. It has a bunch of unrelated settings that are tied together with the machine of Lum the Mad. Unfortunately, this seems like a cheap excuse to put a bunch of settings together and publish a book. The settings themselves are interesting, but not really detailed enough. If you like this idea get Well of Worlds instead. Actually, you'd be better of getting The Great Modron March and Dead Gods too, before getting this book.
Is the review positive or negative? 