This book is the final volume of Crisis tie-ins and the contents are a bit of a mixed bag.
The book starts out with obscure comics like Amethyst, the Omega Man, and Blue Devil and doesn't really provide enough information for a reader to actually connect with the comics. The same could be said for the Legion of Superheroes stories.
On the other hand, the final three issues of Wonder Woman are great and it's a very fitting ending for Pre-Crisis Wonder Woman that actually has some moving moments in it. The Superman and Supergirl stuff is all golden. We get to see the first appearance of Superboy prime and there are some fun team-ups. Overall, while flawed, it's still a fun read.