I like it. I really like it with Zelda WWHD. It's outstanding for non-gaming uses like eshop, netflix and youtube. It actually really wows people when I have a party and we control the youtube music playing on my sound system with it. Girls can search for tunes on the touchscreen and giggle. It's great.
I think the drawbacks so far are that it has been forced into games that don't need it (Mario3DWorld) and not used in some cool ways that have potential yet (like how Zombi U used it). Part of the problem is that 3rd parties aren't taking advantage of it and Nintendo can only make so many games.
I would improve the gamepad by making it slightly smaller. The screen could be a little smaller and the device itself more streamlined and ergonomic. That would make it look cooler. I think Nintendo had some doubts as to weather they wanted to make a tablet or a true dual analogue controller, and the hesitation damaged the end result a little. They should have made it a full-on controller, just with a touchscreen.
They also need more developer support making unique adventure and puzzle titles that exploit its uses, and they need to ignore it when not needed for traditional platformers and action titles.
