I've got mixed feelings about this. On one hand, quitting felt very good. On the other, this is admitting failure. I am not comfortable with it. I think it's because I didn't even fail spectacularly, it's because my stats were generally good, but one or two always fell just short of acceptable.
I realize that might make some other folks feel good, knowing they came as close as they could. For me, it intensifies the feeling of failure. Hasn't done much for my self-esteem over the last several months either.
It's a good choice to move on and I can't say I didn't learn anything.