Okay, Ive recently come into the DC world and realised that they do big events better then marvel (house of m and civil war combined are nothing compared to crisis on infinite earth). This book is one of many that are leading up to the infinite crisis, DC's big story of 2005 (if im correct, dont quote me).
The problem here is not that its absolute rubbish, its just not really that good in comparison to all the other lead-ins. its a rather average lead-in compared to the omac project, villains united and day of vengeance. The ending wasnt really that shocking either.
Anyway, if you are really interested in the characters in this book or are a person who wants to collect all the lead-ins, then go for it.