Unlike many new series, Arrow does not let you down after the pilot, but builds the characters, plot and back story brilliantly. Okay, every now and then there is a cheesy bit, but those bits can be forgiven by the overall quality of the production. Stephen Amell is particularly good and believable, and carries the series well. Many of the cast members are really good quality actors, although a couple of the main character actors I would replace. Particularly the actor who plays the sister of Oliver I find weak, but so far, just a minor annoyance (just as the rat-rug Stephen has to wear in the flashbacks).
Here in Europe, we're further behind in the series than in North America, but I find it so exciting to watch, I can't wait for the next episode so I've been watching bits and pieces on Youtube.
Fortunately, the broadcaster here in the Netherlands sends out each episode twice - first on Sunday evening, and then again late night Wednesday. Second time round you see more of what's going on, because it's so fast paced, somethings get missed the first time.
I'm really looking forward to getting the series on DVD! There is already a second series contracted - yay!!!