In OB, where you were forced to grind for +5's, getting them made it a bit too easy, so I would do a bit of grinding, but turn the difficulty up a couple notches every few levels. Fallout, what the hell was that? Harder combat means quicker levelling, when it felt far too fast anyway.
I reckon hard, not hardest for Skyrim. Seems the wolves, Orcs and bandits died too quickly in the hands on reports. The fact that even on novice, a giant could one shot you, and Necromancers and bears were a challenge, sounds good to me though.