That issue of BP is siting on the coffee table in front of me right now...I used to get depressed listening to Jaco, Stanley, Victor, Marcus et al because I don't play like any of them. But, above all, I want playing to be fun. I can be depressed about Iraq, but music is an emotional refuge of sorts for me.
I feel much better about playing when I view it as an end unto itself. I try to feel good about what I can play, and to play what I enjoy playing rather than what is difficult to play but not necessarily my favorite stuff to play.
Peace to all,
Joe