Here are my first impressions:
1) The experience doesn't really feel new enough (but I will admit, we were playing multiplayer games all of yesterday so any 1 person's time with the gamepad was small).
2) The load times between every single menu is aggravating. Hopefully future system updates make everything a quicker process
3) I love that almost all games are being offered through digital download!
4) Tablet is fun and works really well for the games we've tried it on (which actually only included Nintendo Land)
All in all I'm enjoying the experience, but I won't be super excited until we get a new Metroid/Zelda/etc.