Let's face it; You know already if you like this game or not.
To play and enjoy GH:A means that you'll have to adjust your expectations just right. Let's face it; You know from the moment this game was announced if you would like it or not. You know if you like Guitar Hero or not, and you know if you like Aerosmith or not, as well. Anyone else has no business here. This is a niche game, and it's true qualities lie not in it's flaws, but the overall value, and how it handles it's remarkable mediocrity. Make no mistake. All GH:A is GH3 with and Aerosmith paintjob. Think of it as a giant DLC package.
The song selection and value are the only villians you'll encounter here. Granted, there's nothing wrong with the songs in the game. Each and every one is fun to play, even the ones not by Aersomith. (Which do a good job of added some much needed variety. Some of Aerosmith's best songs didn't make the cut, although they're obviously aware that these songs exist. (Look at the achievements) Also, $60 for 41 songs isn't the best deal in the world. The visual changes do little to justify the extra price. I beat it all in less than a day.
Other than that, you know if you like Guitar Hero or not. It was a longshot, but somehow we, the members of today's gaming culture, have accepted plastic guitars of all things into the mainstream. If money's no issue to you, and you're a fan of the series and the band, there's no reason not to pick this one up.