Unplayable
I want to like this, I really do, but even with all the options turned down as low as possible, with every other programme shut down on my computer, and the connection running as fast as I can make it the game still lags to the point where I can't even string 10 notes together. While the quality of my computer is at least partly to blame I've never had lag problems like this with other games on NG, so a portion of the blame must go to your game. I see a great many other people are experiencing the same problems as well.
I'm sure the game is excellent on a top end computer. Of course with the graphics turned down it doesn't look too sharp on mine, but at least I can see that the numerous options and sheer ability to customise everything means this game must have a lot of replayability (though I can also see this game getting very repetitive).
Unfortunately I can't get half way through one song without quitting due to frustration, so I can only give you a (pretty generous really) 4.