Return of Wally West kickstarted the entire Rebirth soft reboot, and arguably, could have also triggered a chain reaction turning DC Comics on the right track, after so many missteps done during New 52 days. However, while Wally's return was a very emotional and very acclaimed moment, it didn't really lead his character anywhere.

This issue focuses solely on that problem, and finally gave him a purpose, a new direction he could go on with his life, and characters to share his time with. I welcome that, a lot in fact - being hero is one side of a coin, and the other is his alter-ego. Sure, in some cases one is not needed - Joker could serve as the biggest and clearest example, but additional depth or potential for future development is always a good thing, and Wally, in a span of just one issue, got that. He's portrayed as flawed human, who wants to be a hero, but at the same time is lonesome, disconnected from the new, altered reality he ended up in. All that, naturally, makes him more fleshed out and relatable.
Another very pleasant surprise was the return of Frankie Kane. She wasn't just a deus ex machina, existing just for the sole purpose of pushing Wally in intended direction. Nope - she's had personality, past and quite frankly, future (let's hope for that, at least). That's the beauty of Rebirth - it keeps bringing back what was great in pre New 52 DC Comics, and makes them feel like we've never lost them.