I haven't played this game because I pretty much expected it to suck, but isn't it essentially a reskined Project Diva?
If it is, it's hard for me to imagine that the core music gameplay is
that bad.
For example:
Not sure what you read, but this
Isn't the case at all.
Project Diva is a
very competent Rhythm game—it's my favorite rhythm game period, to such an extent that I can't really imagine anything else topping it, at least at this point. The way that the notes stay in sync with the video, and move in patterns which are consistent but only discernible with practice... it's just masterfully set up.
It's also designed to fit Vocaloid-style music, so I never expected it to translate too well to Dancing All Night, but it can't be THAT horrible. What did they do to screw up so absolutely?