Guitar Hero Epidemic

There's a relatively long story about the first time I heard about this game, but I'll just start with the first time I played it. My friend told me he finally bought the game, as I knew he was interested in it for a while. I kept telling him how silly I thought the whole thing was, and that it was for kids, and that older people just look stupid holding a fake plastic guitar. And well that's what I thought the first time i saw him play it - he looked pretty stupid holding a fake plastic guitar. But it was just a bunch of us hanging out, and we took turns playing and playing multiplayer (2 people can play if you have 2 guitar controllers), so eventually I started getting into it. Then over a course of time I began to play it... a lot. Pretty much whenever I was at his house, or someone's who had the game, I would play, suffice to say, it gets pretty addictive. I used to play real guitar, and by comparison I can say that this is much easier to learn, and gives you a false sense of accomplishment in which you begin to believe you are actually as good as the writers of the songs.

Good interaction desgin:
-The design is quite trustworthy at this point (the latest game is Guitar Hero 3). Since the first one, there have been many revisions and firmware updates, etc as is usual with most video games. The main objective is to hit the note at the right time, and although I sometimes note a delay in response, that is simply off-beat, most of the time you get used to when you have to hit the note.
-The design of the controller is appropriate, as a mock guitar, with simple buttons and a 'strum bar'. It functions well in the fact that it represents a guitar.
-It's a smart design, it has the affordability that someone who's never picked it up before would recognize what to do. It could be different sizes possibly to accomodate someone larger, but assuming their target included kids, it accomplishes the task.
-Responsiveness is really what the whole thing is about. The fact that what happens on screen immediately reacts to your input on the controller, is how you perform wel in the game. The controller also has tactile feedback since they ARE large plastic buttons you are pressing - although they dont have that 'bump' feeling that keyboards have for example.
-It's not necessarily clever since it does what you expect, and not doesn't really surprise you right off the bat. What does surprise you, is how great you are at playing 'guitar'.
-I would assume this game is Ludic, since having fun is what the whole thing is about. You pick up the plastic guitar, and instantly you feel like you are in a band.
-Although there are differing opinions about the comfort of the guitar controller, the game is generally a pleasurable experience. Simply follow the notes on screen, and push the buttons + strum bar at the right time to play along with the song.

If I was given the chance, I would change a few minor things in the game, but mostly I would want to be part of the team at Harmonix designing the actual controller. They made a few different style of guitars (differing between the PS2, Xbox 360, Wii) and some were wireless etc, but I would like to simply make it a bit more ergonomic. An example is the xbox controller (the Explorer style) in which you have to sit in a contorted position to hold it if you're sitting down.

The latest version:
http://ecx.images-amazon.com/images/I/51smsnSdCHL.jpg

An in-depth review of the original game:
http://www.gametrailers.com/player/8973.html

Some random party on youtube: