I don't watch lots of anime, but I started watching Corpse Princess when it first came out. I noticed they reviewed it here last week and I completely agree with it, it's definitely not what I thought and hoped it would be.
I also started watch Shangri-La as the premesis looks extremely interesting, but I ended up being extremely confused about the show. I just couldn't see what kind of show it tried to be, with a drag-queen battle 'maiden', serious environmental and sociological themes and a crazy, economically powerful little girl who keeps talking to her teddybear. When I saw a schoolgirl with a way too short skirt explain an extremely complicated economic theory I pretty much gave up on it.
Naruto also disappointed me in that it just kept going on way too damned long. That and they apparently barely give Rock Lee any screentime in Shippuuden. Fuck that, his fight with Kimimaro at the end of the original series was easily the coolest fight of the whole show with actual interesting fight choreography. After hearing they barely show him fighting in Shippuuden I knew Naruto already had it's best moment, so I didn't bother with watching the rest.