Metallica is my favorite band, and guitar hero is one of my favorite games. mix em together and you get pure awesome
One of the coolest things concerning costumes, is that you can make it that the band looks like themselves in the '80's (Robert wasn't in the band in the '80's but he still gets a differnet costume that looks like him when he was living in the '80's).
The gameplay is the same ol' guitar hero we know and love, except the songs are faaaaaar more accurate and the difficulty is just amazing. It's balanced, easy is easy but a tiny bit hard, medium is medium with a taste of hard, hard is hard, expert is haaaaaard, and expert+ on drums is near impossible.
If you don't have a ps3, wii, or xbox 360, go ahead and buy this game for the ps2.
The ps2 version may not have online, but playing with friends is still very fun.