Are the Rage Against The Machine the best band ever ?

I love Rage. They're unbelievable. They're intelligent. They're controversial. They've got a knack for writing great songs. But...I wouldn't identify them as the greatest band ever. They lack a certain amount of diversity to bear that title. The rap vocals/metal guitar choruses grow old too quickly. If only Zack would just sing a little bit...you know, mix it up. Just my opinion.