The first half of this book, with the time traveling plots, feels rushed. I fully admit that I might like the part with the Legion better if I knew anything at all about the Legion. But it just seemed like it was over so fast, almost like it was a mandated crossover that the writer was just getting out of the way. Likewise the "ten years later" part of the crossover, featuring a very dark future version of the heroes. It felt like a bit of an author tract against dark-for-the-sake-of-being-dark comics. Which, point taken, but others have done it rather better.
Things improve in the second half, where the book devotes itself to dealing with the fallout from [b:Identity Crisis|26085|Identity Crisis|Brad Meltzer|http://d.gr-assets.com/books/1327948044s/26085.jpg|530148]. First, Tim dealing with his father's death
and then a newly dangerous Dr. Light, adding in all the extra baggage of the villain mindwipes Identity Crisis revealed
. I'm honestly surprised that Teen Titans was the book to tackle these issues, but I'd say they did a fairly good job of it.