Not worth full price.
The game is pretty good, they get extra points for the remake of One being as totally awesome as it is and the set list ain't bad.
Here's my beef with it. As someone who tracks his scores online, as in, on a website, not leaderboards... The game's largest flaw becomes glaringly obvious: After you beat a song in Career mode... You no longer see your best score. Yes, you see the stars, but when you're trying to one-up yourself, stars take a backseat to raw score. That alone made me return the game in 24 hours.
I don't get why people think I'm crazy when I say GH:A was better than GH:MT. Aerosmith was done WELL, really well. It tweaked the mechanics a bit from GHIII and was a very welcome addition to the series. Would I pay full price for a GH spinoff? I'd say no. They don't quite live up to the main releases. But they're games I'd recommend buying when the price point drops.