As others have stated 52 is a very interesting read and actually good story telling for a big company wide event.

As for Final Crisis, if you have ever wondered what it would be like to drop acid then read Final Crisis. It makes no sense, it’s extremely bizarre, and it jumps all of the place. There is no way Grant Morrison was sober when he wrote this. The only reason I was even interested in it and picked it up was for the return of Barry Allen.