I think it's growing and getting better with every episode. We don't know what's happening yet, we just have to let it play out. I don't think it will be a black and white resolution, I think watching it a second time after it's over will be highly rewarding, there's so much information packed into every episode. Nolan is known for dense non-linear story telling, this is the man who wrote Memento and The Prestige.
There are tonnes of theories on what's going on, you can't really trust anything though because the creators are taking us on a ride, it's written and shot in a way that you can't tell what is important and what's a red herring. The way certain shots are framed lend credence to certain theories and then in the same episode something else will diminish the credibility of that theory without ruling it out.
There are a few theories that there is a split timeline and Dolores is repeating actions and getting flashbacks of events from 30+ years ago when Arnold was still alive. So far, I don't think we can declare with any confidence Arnold's motivation and what role he is playing at the moment. The information we glean from Dolores, such as Arnold talking to her, is unreliable. We don't know if she's simply malfunctioning, becoming conscious, or if she has some kind of Trojan Horse which Arnold programmed into her and is acting exactly as he planned.
I personally think Dolores is starting to act out of her own free will. I think it's more likely she has old code or memories of when Arnold was trying to create consciousness in the hosts rather than a set mission from Arnold to undermine the park.
There was foreshadowing of this in episode 3. Bernard talks about how primitive man believed his thoughts to be the voice of the gods and how Arnold was trying to use this theory to jump start consciousness. I think Dolores might be hearing her own original thoughts for the first time and thinking they are directions from Arnold, her creator/god.
Ford and Bernard seem complicit and aware of Dolores' awakening too but we don't know their motivations.