It's great to see a favorite band of mine performing on Rock Band, especially AC/DC. But it's not worth the $40.00.
It's because the songs are done live. Yes, that simple little mistake is what messed the gameplay up.
During concerts there are long instrumental sequences. In this case, Angus, is playing his guitar and you're just strumming the same thing over and over and over for at least 2-3 minutes straight and it becomes very boring.
The songs do not sound the same because, as stated above, they are performed live. Songs just don't sound the same when they are live.
Furthermore, the game's buttons were computer-generated and so many times during the songs there are times when you're expecting to push a different button or go to another solo, etc, but rather you're still pushing the same buttons---not always in the correct timing either---and you're thrown off track and you mess up.
The gaming experience would of have been totally different if the songs were the originals. I would not have purchased this game is I knew how terrible the gameplay would be.