If you're blues fan, this is a no-brainer; one of the best blues singers of all times, caught live, at peak of his powers, well recorded, in great company (Otis Spann, James Cotton...).
And yes, he mostly sings and lets the playing to others;
there's also an Otis Spann vocal on the Farewell Newport Blues.
Energetic, rough but very tasty (although some would say macho) blues of Muddy in Newport will haunt you if you're not familiar with the artist; if you are, this is at the same time a fine performance and a best of album.
Also, I believe the rock fans might like it too (and I'm primarily a jazz fan and I also love the blues).
"Got my mojo workin'", sings Muddy, "but it don't work on you"... Well, it worked on me just fine!