It feels really rewarding
The best part is I was 8th person (tracked by true achievements) to do the newest DDR which you needed to play 100+ hours of random songs in order to level up every song to 6. Boring achievement which got harder the more you played.
DDRU3 is impossible because the song "Streamline" I believe it's called requires you to GOOD every arrow which is impossible. The timing window is wrong and after 3 GOODs the 4th will always MARVELOUS or something like that. I cannot get a single GOOD on it so it's just freaking ridiculous. They should have never added MARVELOUS as it broke the game.
In an email to Konami a member of x360a sent Konami replied that the achievement isn't glitched just hard.
If it IS possible to 100% DDRU3 Konami made the challenge too hard for a human. I know some people trying to make a bot to attempt to GOOD every arrow.
....I love DDR to an unhealthy extent