You'd be surprised by what you can do with a little knowledge and practice. I'm just sort of getting into making comic art and a while back I was coloring something in that style for the first time. At first it looked terrible, but then I watched some tutorials and re-did it with different techniques and it looked miles better.
I am slowly working at developing my skills as a Letterer. I get what you are saying, but I also feel some people can just do line work well, while others slave away, and stay mediocre. I am definitely in the second category.