It's the challenge in woodworking that I enjoy. Woodworking can make me feel like the dumbest idiot in the world when I'm stuck but then you have these moments when you feel like a god amongst mortals when something fits just perfect. I've been intimidated by projects in the past and avoided them, then I've taken on some seemingly scary stuff and to my surprise managed to pull it off. It's all about perseverance really, you have to commit to achieving your goals in the project and you'll get it done in the end. Through the process you'll learn as well and that's where the satisfaction comes in, for me at least, you've done something that you thought you couldn't do, you've made the impossible.
I don't think that many projects come out 100% the way you envision them when you're attempting to make something new, it's working with your "mistakes" that gets it all done in the end. I don't think there's a carpenter in existence that doesn't slightly botch something up during the process of building, being efficient is working with these screw ups that more than likely only you will notice anyway (depending how extreme of course). Look at it this way, no two people sign their name the same way and this individuality goes with woodworking as well, how you hold and work a tool is unique to you and the end result is something that you and only you could have made exactly that way. UNless of course you're a 3-d scanner or some kind of hybrid man/CNC machine.