It was pretty decent. I'd made no plans to watch, just happened to see it on the schedule 2 mins before it aired and decided, "Meh, why not?"
Was good. Except the recycling of Luthor Manor. lol.
That said, I think if it lasts it will only make it 2 to 4 years.
It's no Smallville. Even with all it's weaknesses, Smallville had some great dynamics with much more familiar characters played by decent actors. Arrow doesn't have those same dynamics or actors, IMHO. So while it's good... I don't see it surviving very long. It's premiere ratings where good for CW, but not great for them.
I'll keep watching, but I don't expect it to be on the air in 10 years like "Smallville" was. Not by far.