The terrible list of songs and the easier difficulty makes this game less of an improvement from Guitar Hero 2.

Hard difficulty, on the other hand, lives up to it's name

The controls are perfectly responsive, obeviously important for the harder difficulties

However, Hard and Expert difficulties suffer from severe balancing issues--song difficulty remains fairly lenient until it hits a brick wall 80% into the game

The game's difficulty curve is also one step forward and one step back--having played both Guitar Hero II and III, I can safely say that the transition from Medium to Hard difficulties will be a lot smoother for most people, as Medium now introduces Hammer-on sequences early and often; this will be beneficial to casual players who want to alternate between Medium and Hard most of the time when they play, as the only major obstacle they will have to overcome is learning the fifth fret button

Basically in the battles the screen is split in two with each player having a side and instead of getting Star power, which is a power up in the one player mode, you get attacks like upping the difficulty for example from easy to medium which adds a string/buttom, or flipping the oppents color buttoms/strings on screen upside down, or making the notes flash making them easy to miss, another you have to shake your Whammy bar, and broken string where you must puss the string bottom repeatedly to repair the string

The terrible list of songs and the easier difficulty makes this game less of an improvement from Guitar Hero 2.