Sometimes it's legitimate, but about 40% my deaths are due to the game lagging out on me. I don't know if you can alleviate the problem, but it might be something to keep in mind.
A decent effort, but it doesn't always register chords when I play them despite me pressing the buttons at the exact same time, so there's some lag issues to take care of. Pretty much makes the hard badge all but impossible for me.
 "Accelerator"){kind=icon}
 "Santa Rockstar: Metal Xmas 3"){kind=icon}