Not a bad way to kill an hour. The action scenes were done well. The ambience was a bit dark though. Stephen Amell's voice-over should stop. And Katie Cassidy needs to be given more to do.
I noticed the Deathstroke mask on the island in the opening sequence. So, I did some research (wiki) on Deathstroke. It seems Deathstroke (Slade Wilson, known originally simply as the Terminator) is about to take out Green Lantern but is stopped by Green Arrow who shoots him in the eye and thus saves Green Lantern. Deathstroke is a multi-talented super villain in the DC Universe.
In the near future, we will be seeing DC characters China White (in Episode 2) and Deadshot (in Episode 3).
Never.Avengers = Marvel ComicsGreen Arrow = DC comics.BTW, the voice over on Dexter can sometimes treat the viewer as dumb. For example, Dexter saying, "I need to check Louis' laptop." I mean, come on...