I personally would love to own an electric plug in car, but they keep designing these things with old fashioned lithium ions rather than newer lithium schemes that charge much faster (however, how do you pump in that much "juice" fast enough into them? The limiting factor is really there are no Mega-Watt outlets on the easily accessible market...), last longer, lasts for more charge cycles, safer (less likely to catch fire, lithium fires DO NOT go out), at the cost of some energy density.
But in general, that is because the cost for the newer battery schemes is prohibitive, so I don't blame them. The technology is still relatively new. Unfortunately, the rest of us will just have to sit back and watch while the car developers try to push production cost down while working out all the engineering problems and refining efficiency.
As for these plug ins, I am waiting for a 100% electric long range vehicle, which is a long ways away. Everything on the drawing board is for short range electric or short-to-midrange "plugin hybrids," which makes sense. The Chevy Volt, when I heard they were putting in an ICE into the damn thing, I thought: great, now we just doubled to tripled the number of moving parts (Yay, lots more maintenance charges and parts your dealer can charge you for!), introduced gasoline, and I have to push all that crap around in the car reducing efficiency. Alas, automotive industry still diehards for gasoline and ICE's, but as I said, its an understandable stopgap move on their part.
Slightly off-topic, whatever happened to the lithium-titanate technology http://en.wikipedia.org/wiki/Lithium-titanate_battery
? Hard to find much hard information on it, just lots of conjecture. The Titanate battery seems good for a car application, but the problem as I said before is: yes, it can charge a car in 90 seconds... but the amounts of energy a car requires to push that crap around is enormous, in order to fully charge a battery you would need theoretically a charging device that provides energy on the order of Megawattes. You engineers out there know what I'm talking about. I would not want to touch whatever cable that is designed to care that much condensed electrical flow.