Some dry food are good. It's your job to shop for the good ones.
Even though I don't think it's bad to feed a dog table food (as long as it's not crap), I think you might miss important stuff in his diet.
All in all, a dog is a dog, he'll live happy and give you love all his life, whatever kind of food you feed him.
PS, for some bread, always giving table food might make them more annoying when you eat your own meal, always starring you, trying to steal it on the table when you are not looking, since he knows the taste.