Despite the fact that if the drummer sucks, the band sucks and that a number of band leaders are drummers, we are mainly a supportive instrument. Very few bands feature the drummer even though they are (in some cases) the reason for a band's success. I remember being told in college that a good film can be made better with good music but there is nothing good music can do for a bad film. I don't think the same applies to a good drummer and bad band, but the drummer can certainly help the band be better.