I love this band. Totally and completely. I just bought the 2 cd set Symptom of the Universe 1970-1978 and am listening to it today. Black Sabbath is a band I could listen to every single day and never get tired of them.
Can you imagine hearing those guys back in the day? Holy shit! Nothing like that had really been done before, unless you count Led Zeppelin (which I do, but Sabbath is much different). Without them we would have never had the great heavy metal bands.