How comparable are the two games? I love Descent but I love the idea of a game about thieves looting from each other. If Cadwallon is half as fun as Descent then I can't wait to get this game.

Cadwallon is fun, but Descent is deeper (no pun intended). Cadwallon is essentially the same basic scenario over and over, with variations (run around the same board and try to find treasure). Descent is much more variable.

Really not the same game at all. Descent 2 is a quest based fantasy game where heroes can "level up" over the course of the story. I like Cadwallon, too, but it is more of a family game. Much simpler, but still a lot of fun.