Condit's fight against Hendricks was far from disappointing imo. He fought a great fight but Hendricks was just hungrier and did what he had to in order to get the win.
I am mainly disappointed in younger guys that just don't seem able to put everything together but if they did would be competitive at the highest level in their divisions. Guys like Struve and Guillard.
One fighters I had hope for that didn't pan out was Lesnar. The guy was huge and extremely strong but couldn't learn to strike to save his life.