Kirk is obviusly counting Garage Days and Garage Inc so its  
 1.Kill em all 2.Ride 3.Master 4. Garage Days 5. Justice 6.Black 7. Load 8. Reload 9.Garage Inc 10.St Anger 11.New Album.  so by saying it feels like their sixth... he means its a worthy sequel to Justice!!? Fuck Yeah I'll have a bit of that, if its anything like the power four tallica albums... Hoooollllleeeee fuuuck! Music could be coaxed back to the way it shoulda stayed! Thrash!! 80s!!!! Metallica!!!!! 
 I believe they can do it like I really do.