Protein bars all have a lot of saturated fat, too, and I doubt it's from great sources. I don't really understand why they need that fat in there. Probably as a binder, or for the texture. It's not really clear to me.
My friend said she once went on a trip through Europe once and was poor and trying to stay really fit while she was there, so she bought a ton of protein bars and ate a lot of them, and when she got back her cholesterol was through the roof!
I used to eat more of them myself, but lately I tend to eat more deli meat, tofu, and nut butters (cashew butter or peanut butter on toasted whole wheat with an underripe banana sliced up on it -- so good!)
In fact, I hear one of the original Ironman triathletes used to rely entirely on PB & banana sandwiches for workout energy, and mocked people who ate protein bars. "Come on, just make a sandwich!"
The bars are convenient, I'll give them that, but even the Clif builder bars are 240 calories for only 20g protein. And when I eat I either want a lot of protein or something that tastes good. If I want a lot of protein I'll have a 200 calorie, 50g protein Isopure shake. If I want something that tastes good, I'll have something else. Protein bars don't really fit either niche for me.