Scheissenbedaurn is the vague sense of disappointment that something thought to be really bad or in awful taste turns out to be not as bad as expected. (From the German, meaning literally: "shit-regret")
I left concerts by the Dixie Chicks and by Britney Spears with a vague sense of scheissenbedaurn. They merely mildly sucked, but neither was the world-class suckfest I longed for. The same thing cannot be said about the enormity that is a Barbra Streisand concert.