A good villain is a key element for a good adventure. The Raven King fits that bill (great artwork inside showing him in all his glory) and the potential for using him again is VERY high. There are 24 plot seeds included to create future adventures. There is a darker plot element involving domestic violence, but it is handled thoughtfully by the author.
On the negative side, I did note that under the sample encounters, 'A Speedy Delivery Gone Wrong' and 'Four and Twenty Ravens Baked In a Pie' that the same paragraphs are REPEATED.
I didn't purchase this with the idea of using either Champions or Icons to run it, so I have no concerns about stats really. A good plot and a good villain should not rely on some part of a particular game system to work. As has often been noted, especially for super hero adventures, the GM should tweak the villians to matchup with his player's characters.
[4 of 5 Stars!]