I have been been playing guitar hero since the first ps2 game and i do really think this is the best version yet. metallica music fits this kind of game really well, however it is a shame you can't split the rhythm and lead guitar tracks up though. however you can still sing , play guitar , bass and of course drums.
overall i think that the set list is good but there are a few metallica song i thought should have been in the game like damage inc ,leaper messiah ,don't tread on me, until it sleeps, hero of the day, the unforgiven 2.
but apart from those little problems it doesn't stop this being a great game.