Interesting, it's odd that they did not turn out anything like you expected. I guess the key is to think about, and even write down what you thought the pictures would have, and how they actually lack it. Was the exposure right? The composition? Timing? Light? And then try to improve on it the next time.
I've had the same thing myself, sometimes I'll expect great stuff, and be very disappointed with what I get back. It's made worse by the fact that the worst incident was halfway round the world, and I'm unlikely to return any time soon. But my mood changes when I see a shot I am happy with, and even more so when I don't expect much, but the shot really delivers.
Don't be hard on yourself, learn more, and enjoy the learning.