I'm not a big fan of the Zumba for Wii either - definitely can see that it would be super frustrating for those starting out, because like jhttfn said, it doesn't track your movements very well at all.
I've never tried the Zumba DVDs, but I do have a Zumba video playlist on youtube - my absolute favorite instructor that I've found is "zumbamaniacz" - here's one of her videos/routines that I love:http://www.youtube.com/watch?v=o9k7XrXknag
Other than that, I would really encourage real-life Zumba classes at the gym - there are a couple instructors at my local Y that I just love! It's so fun!
Someone who is busier than you is working out right now.
There will come a day when you can no longer do this. Today is not that day.