Solid amount of good songs, a couple stinkers, but the guitar hero gameplay and feel are back for another round.
One gripe I have is the dumb boss battles. They fell tacked on and pointless and beating them didn't give me any sense of accomplishment or anything. Oh and the difference between medium and hard difficulty is sort of steep, but manageable after a while. Oh and the excuse for a story was lame, luckily the cutscenes are skippable.
The PS3 version of the game gets some perks in the form of downloadable track packs for 7 bucks each so that is cool, I haven't bought any yet so I can't tell you if they are good or not.
Overall, a solid iteration in the GH franchise and well worth the purchase for new and old fans alike.