I find the pad to be fine. The only problem I have is that it tends to shift on carpet, it has to be moved back to its starting postition after each song.
I used to get off center a lot, but after some practice, I do fine.
After playing for a week or two (I'm a newbie), most of the "very hard" step charts aren't all that hard. I've started juggling while playing the very hard songs to make them more challenging.
Most of the Super Hard songs are plenty challenging for me (even without juggling :-) ) It will be quite a while before I'll be able to master them. The Bowser Very Hard song is tougher than most of the Super Hards. I like the song selection, and 29 songs is enough for me.
I like the idea of the story mode progression, but the unskipable cut scenes get annoying.
I avoid Mush Mode if I can.
And speaking of juggling, I'd like a Juggle Juggle Revolution Revolution game.
Here's one of the controllers.