I really like Motorhead. However, they are probably the heaviest band I can take.

I have never been into thrash/speed metal and never understood the appeal, and musiciality, if any, of bands like Slayer, Metallica, Pantera, Sepultura, Exodus, Testament, Anthrax, Metal Church or Megadeth. I have heard them all and they all sound like more or less organized noise to my ears.

Motorhead have a different swing. They are heavy but there is an element of rock'n'roll, and blues, that make them sound different. I hear more melody in their music, and Lemmy's lyrics are generally speaking very good, something I cannot really say of most of the above mentioned acts. I hear some black music in Motorhead that I do not in other extreme metal bands.

My main issues with these bands are a) the lack of groove in the drumming department and b) the horrible singing (I know it sounds ironic as I "like" Lemmy but I feel he at least tries to sing).