lots of arpeggios in metallica. Fdd you should start off with something besides Metallica if you wanna learn better rhythm, start slow. Hetfield is an insane rhythm player, scary thing is he uses mostly downstrokes. The Sabbath book is probably better for now. Then go back to the Metallica, they have some crazy time signatures and serious tempos...please tell me you didn't start with And Justice For All, talk about some serious technical work, and time signature switches in the middle of songs. I've been playing 14 years and that is some seriously hard stuff.