Thoughts in no particular order:
Man, this board has done a huge 180 on Felicity, once revered as a goddess both here and on the whole of the Internet. She's great, and anyone that says otherwise is crazy. I just don't think people like the resolution of her story arc with Oliver. Them finally getting together was a great payoff to a long (maybe too long) journey.
For what it's worth, Amell has said that Oliver is done with the hood. It's hard to see how that could be the case, but that's what they say.
I'm looking forward to next season because I believe we'll get to see Oliver's year in Russia, working with the mafia and his rise through the ranks there, which will be the fourth year of his "death." I think year five will see a return to the island.
For just a moment it crossed my mind that Damien Dark (or Darhk or possibly Dr. Darkk, having now looked it up) might be a pseudonym for Bruce Wayne. Then I remembered that he is an ancient person, just like Ras. Bummer.
Thought Oliver's fight with Ras was really good, though the gunshot threat and miraculous survival due to his body armor was pretty contrived.
All in all I agree that while a lot happened this season, it doesn't hold up to the first two, but that's a pretty high bar. The biggest difference was the fact that Hong Kong wasn't nearly as compelling as the island.
And on the side note of the rest of the DCTVU or whatever we're calling it, I realize that Supergirl is on CBS, but since CBS and WB actually OWN the CW, any talk that they can't cross that show in with the Arrow/Flash universe is stupid. Why in the WORLD would they try to separate them? I'm not saying that they need to cross over every other week, like Flash/Arrow do, but let them live in the same world at least. Rabble rabble rabble.