DDR Extreme is not impressing me.
None of the songs have yet jumped out at me as being irresistibly cool. Maybe I just haven't gotten to or unlocked them yet, but so far it's okay but not great.
The UI has changed. It's not obviously an improvement. Various steps have different effects - scrolling through songs is backwards from MAX and MAX2; changing difficulty is single up/down steps instead of double, so it's much easier to do accidentally. There are fewer songs visible at a time, and you can only see the scores of the current song. On the plus side, you can see letter grades for all difficulty levels for the current song. And I never thought I'd say this, but I miss the groove radar.
This is all compounded by one pad finally failing annoyingly and starting songs while we're still scrolling through them. It's not the game's fault, but it's not helping any, either.
The Eyetoy stuff is not working so well for us. Having a dark-wood wall behind it probably isn't helping any.