Carbs are certainly not bad for you, but eating carbohydrates in excess can be bad for weight maintenance.
In order to reduce the calories you get from bread buns/baquettes etc. just carve out the fluffy bread on the inside. This is a simple way to reduce the 'empty calories' by up to 90%! It also allows more room for the healthy stuff, sch as salads and fresh meat, in your sandwiches.
Also, don't be scared to ask for the bread to be carved out in sandwich shops like Subway. You might have to repeat your request to most 'sandwich artists' but they'll happily do it!