I think if I didn't watch The Flash I would have enjoyed this a bit more. Unfortunately for the book, I do watch the show. And that show has thrown speedster villains and allies out there a bit too often for me. Flash has such a fun set of villains with a diverse set of powers, but the show keeps focusing more on the speedster villains. So having the first story of Flash's Rebirth series have a ton of people in the city suddenly becoming speedsters and the big bad of the arc being one of the speedsters did not thrill me.(show spoiler)
My personal feelings about an abundance of speedsters aside, I did enjoy some of the new characters introduced, particularly Flash's new speedster love interest who decided to start helping all new speedsters in the city. She was a sweetheart, and I liked her budding relationship with Flash.
I also really liked the new Wally here. He rubbed me the wrong way when he was initially introduced in New 52, but I grew to really like him after he went through quite a bit of character development, so I was happy that he hadn't lost that development. Wally struggles with his new powers here, and I very much look forward to seeing him continue to learn and grow as a superhero.
Flash's Rebirth series didn't have the best start for me, but I'm more hopeful for the next arc.