From what little I know of The Spectre, I think they got him right. Wiki Spectre article.
The action in GA was good, which I forgot to say originally, but it didn't exactly make me say "Wow! I want to know more about Green Arrow!" It made me say "Oh.....Malcolm McDowell is still awesome. Good for him"
True, it wasn't as epic as in the Darkseid vs. Superman and Supergirl fight, for instance, but it was still more compelling than the action in the Spectre one. As the wrath of God, who's gonna be able to challenge the Spectre in combat? Ollie, meanwhile, is a mere man and get kicked around a bit.