I feel like the Model X design makes some major strides forward in the automotive industry, but Tesla still didn't sell it to me.
They definitely should have focused more on the control and responsiveness of the dual motor AWD system. This is a serious performance upgrade, offering world-class acceleration and a better turning radius in a big vehicle. (the video mentioned it being tighter than a mini cooper, but the 12,500lb Mitsubishi-FUSO FE125 boasts the same thing). Hopefully some promising stats will surface once Alpha builds hit the road.
Also, the way Tesla managed to replace traditional side mirrors with non-intrusive video feeds is amazing. I know that it's pending regulatory approval, but the drag reduction, ease of visual cross-check, and possibility of traffic alert/recognition that this system provides is really the sort of next-generation feature that people expect in an EV. "Man--my car's so old it still has side mirrors" is the kind of comment drivers could be making a decade from now. I like that ModelX went there and brought it on a non-concept car (see: Ford Vertrek)
As far as the unveiling presentation goes, the soccer-mom focus on how easy it is to get in/out of and the storage space was way overdone IMO. It caters to geriatrics and parents of infants. I haven't seen any market studies, but I imagine that relatively few people will select a ModelX (~$100k fully loaded) over an Audi Q7 ($60k fully loaded) because it's easier to unbuckle the kids. Elon does have five boys and disposable wealth, so I can't fault him for catering to his needs.
The falcon wing/doors don't work for me either. Despite the "many iterations" it's still an inelegant solution. Seems like way too much engineering just to be able to say "It's not a minivan." At best, modify it to full length (thanks PV4EV) or offer standard doors as an option for more SUV-minded folks. My biggest gripe with the falcon wing doors is the wide arc it cuts once it reaches waist height. Did anyone else notice how it almost clipped the ModelS in the demo video? Click this link and jump to about 6:30 and you'll see what I mean:
http://www.youtube.com/watch?v=ZbDdJGpNJpQ Looks way worse than the click & drag demo at
http://www.teslamotors.com/modelx
All I can come up with for now. Jury's still out, but I'll be looking forward to new updates.