The doubling of resources can be very powerful at times. I saw this with the Bringer of Dispair which doubles the power. js619 played two of these cards in one hand. The power doubled twice and was around 50 allowing him to score a ton of points. Needless to say, the game was basically over after that. Then he did it again.The 3 cost heroes that can double either resource end up being pretty useless as a result. I find that you are usually better off just picking high impact dreamscape cards given the opportunity (free hero/free banish/free constructs, something that gives 10 honor, or a Vigil's Resolve).
It seems to me that about once a game someone is able to put together a combination that really works well that generates many points. The game is not long enough that the opponent has a chance for their own massive combination. I think this is why the last turn in the game often has someone playing a strong hand, essentially finishing off the remaining points and ending the game.
I've not played any other expansions, so I don't know how this compares to them. Compared to the CoTGS it seems to allow bigger combinations and has a few cards that are much more powerful. If they don't fall during your turn, you are likely to lose.