Summary: I have played all the GH games on Wii or PS2, as well as both Rock Band games. This is by far the most disappointing for me in terms of song selection. I like a lot of different genres of music, including metal. The Metallica songs on here are fine, although I would have liked more older tracks and to see Blackened included (I know its DLC for Rock Band 2 and that's probably why it wasn't here). My issue was with the "filler" songs that were chosen by Metallica.
Summary: You probably dont need to be told what this product is - its quite simply a guitar playing game from a well established franchise. You will approach the game from one of two angles 1. You have a lot of experience of previous games. In that case, this is an add on pack. And an expensive one at that. Although some of the tracks on here are long/and or fast, experienced Guitar Hero player will probably only play this on 'Hard' or above 2.