...so don't approach it like it is. Its a spin off, and its obvious upon playing it that it is, but I don't think its a bad thing. Yes it could have been released as DLC, and yes they are milking Guitar Hero, but no matter how much you say this it doesn't actually tell anyone how the game plays. I got the game because I wanted to play some of my old favourites from the franchise in a band and in better quality, and that is what I got. There were some songs I'd thought should have been on it, but thats personal preferance, and I do think a good job was done with the set list regardless, and I certainly enjoyed it more than GH:WT.
I would recommend this game to people who prefer to play the guitar as opposed to drums or singing, as the songs were picked for the original games because of the guitar parts, and so the same is true here (Probably why I prefer it partly to WT). The tapping system is part way between GH3 and GH:WT (in terms of difficulty) which is almost perfect in my opinion and the note charts have definatly been made more challenging for a majority of the songs on here.
I was slightly disapointed that GHTunes downloadable content wasn't avaliable on here, but then I didn't buy the game for that, and I think if you want to purchase a first or long lasting GH game, go with World Tour, because thats not what this game was made for, only get this if you actually like the songs, because thats pretty much all there is to it.