All protein bars are not alike... and I hardly think anyone can classify them all as garbage...
I know they are processed and all, but 200-300 calories with quality protein, amino acids, and vitamins and minerals that can be stowed in the glove box of your car or the bottom of your breifcase for months at a time is a flexibility you can't beat...
Of course, as someone great once said... "man cannot live by protein bars alone" but the fact of the matter is there are some decent protein bars that are great if you're in a fix for some nutrition... keep an eye on the fat/saturated fat and sugar content... I recommend Protein Plus from power bar or some of the Met-Rx varieties...
I prefer my protein powder+oats shakes at home, but I'm a travellin' man and I don't have the time to precook all my meals... and I'm unwilling to let my appearance/training suffer because of it...
Let's face it, if you're disciplined, a protein bar here and there will make a negligable difference in your progress whether bulking or cutting... competition prep maybe the only exception... I'm not sure which is healthier, trying to get down to 5% bodyfat or eating protein bars...