There are a few photographers that I say have a characteristic "style"... like if you see on of their photos you know for christ sake it is theirs. I think this can be a good and can be a bad thing.
It is good when you are trying to sell yourself, your work as your work. When you are trying to become an all around photography machine that can do anything that is on your plate and not have a characteristic look-feel... then this can be an issue.