I swallowed the bait, and joined the craze -- opinions from a n00b. :p
I am pleased with all the modes, especially since I use DDR mostly as a fun workout. The most "unfortunate" aspect for me is some of the songs... "Genie in a Bottle"? "La Bamba"? Uhh... I know they had to fill it out with some suck, but... it's still kinda "eek!" Thankfully the highly addictive "Butterfly" is there in some form. Even before I played DDR I recall that song getting stuck in my head.
This game is worth playing whether you have mad DDR skills or you are a sucky n00b (like me -- but I'm getting better!). Play in your own home before embarrassing yourself in public!