it is a big part only because it follows after the initial emotions of Love/like....
there is nothing wrong with physical attraction at all or that it may be a big part of a relationship, however if it is the MAJORITY of the relationship then it is definitely wrong. Some people jump into relationships because they are lonely and have a strong physical attraction to a particular person. It is only then do they realize that the physical is the only attraction they have for that person. No mental, no emotional, no spiritual, no connection or "clicking" at all so yes...in that situation only is physical attraction a bad thing... if it is the only thing you have. Otherwise you are not truly happy :3

--Thank you Dr.HQ