You know why the other people are complaining about this thing? Well, they expect it to be like the TV Guitar Heros. WHAT?! If you look at the picture, you'll immediately understand that this is a little LCD game that surely can't contain as much as the console games. Plus, they were expecting modern-day kids to love this. If they love Game & Watch games, then I'm sure there won't be a problem. Otherwise, you were mistaken.
First, let's go over the in-game. At first, they seem confusing to navigate, because you don't know which buttons to press. Well, soon, you find out that the yellow button sets the volume or difficulty higher, and the blue button lowers them. The orange button should be pressed to confirm your choices of volume and difficulty.
Now, the main gameplay is still pretty similar to all the other Guitar Hero games. You just don't strum with the buttons you press. You can also mash the Whammy button (See the fake handle next to the screen?) during long frets to score extra points. The songs are shorter than the originals, and there are only 15 of them, but the game plays well. And also, it's not really common for an LCD game to have voices come out of the speaker.
So overall, it's not as bad as everyone says, once you realize that it is what it's supposed to be: Guitar Hero on LCD.