I loved Geoff Johns' run on The Flash and I've recently starting reading through the classic Wolfman/Perez run Teen Titans. While I've yet to read the original Magenta stories, I find the character interesting and it's a real treat to see her restored to the DC Universe here, even ignoring Wally's need for friends now given his current predicament. Joshua Williamson puts a lot of heart into every story he writes and this one is a prime example of how he can tug o the heart-strings even while setting up a major crossover event.
The artwork is equally excellent. Both Howard Porter and Christian Duce are fine artists and you can barely tell when the story switches between their respective sections here. Hi-Fi also deserves praise for some fantastic, eye-catching color work.
The Final Analysis: 10 out of 10. A great entry point for The Flash and a great opening for Flash War.