The controller:
Good:
- Very happy to hear about the traditional controller attachment - my worries about third party support are all but gone (Nintendo still has to overcome the usual problems of third party support, but at least the controller isn't as likely to count against them).
- Having the remote controller all by itself is Nintendo's doorway to the non-gamer crowd: I guarantee you that Nintendo will release games that use only the remote controller. I know a lot of people are skeptical about the non-gamer crowd, even I am...but I do believe Nintendo is right when it claims that current controllers are too much for that crowd. Many of the non-gamers I know are much more comfortable playing NES games than anything else, because the controller is so simple.
- This is going to allow for some awesome games. Several existing genres like FPS', RPGs and sports will benefit greatly from this controller.
Bad:
- Nintendo has to be careful about how they sell this thing. Too many attachments will turn people off, I hope Nintendo comes up with about 3 basic attachments that cover all of the major possiblities, and I hope that attachments are CHEAP. I also think Nintendo should consider bundling all the important attachments with the system, and possibly selling remote controller bundles that come with all of the attachments. Nintendo can sell them separately too, but don't make me buy 20 separate parts to put together a multiplayer game system that covers all of the bases.
- The same concept that makes the system accessible to non-gamers will make it scary for them. The remote controller on its own isn't scary, but throw in a bunch of attachments and it may be even more of a turn-off than traditional controllers.
- Where are the games? Nintendo must have an outstanding launch lineup to sell this thing. The DS is finally showing it's full potential, but it took several months to get there. Nintendo won't be first out of the gates, and it isn't the most popular home console manufacturer, so a few great games are a must. On the upside, the fact that Nintendo didn't show us anything may mean the games are going to blow my skeevy little mind. I sure hope so!

Ugly:
- Why does everyone thing Apple is so great at designing things? The remote controller does look just like an Apple product: boring and ugly. Just a stupid opinion, though, who cares?
Edit: added one point.