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The Volt excells on twisty mountain roads, at least with the right driver. It's even more fun to smoke ricky rice racer with the Volt than it was with the 2010 Camaro SS I traded in for it. That low CG rocks on hairpins, this car leans less than just about any other I've driven. Maybe it's ricky who needs to learn how to get around a course faster, but this does just fine on the roads where I live.
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I'd love a Tesla too - if I could afford all that, but that's not reality. I don't go on road trips anymore, but I sometimes do need the range extender when going two major cities over, and it's nice to have. Putting this drivetrain into a caddy seems like an excercise in the ridiculous, though. I'm guessing GM did it to finally put it into a car they could charge more for (and actually make money), and because a huge fraction of Volt owners traded in a Caddilac, a beemer, or an audi for it - hint, they are run by bean counter marketing types.
Some things are less risky if you're competent. A lot more people think they are, than actually are, of course.
Yes, the Volt has a dinkier battery capacity than the Tesla. For one thing, for longevity, they only let you use 10.5kwh out of a nominal 16 kwh. That's why they think they can afford an 8 year/100k mile type warranty on it. But duh, you can make it bigger, use more than one, and so on. The Tesla actually gets more miles/kWh than the Volt unless you're racing, as well - the Volt is a heavy, solid car, not the latest greatest no money spared lightest car you can make, like the Tesla is.
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(Yes, I'm a very serious electronic engineer {Hence the Volt}...but one who will never buy a car I can't just buy the one I just test drove. When Teslas hit the real street and I can just write a check and drive away - one of them is going to be mine - too much danger putting down that much money and hoping to get one of the "good ones" rather than the "hangover monday" cars - and the wait is excruciating).
"More software projects have gone awry for lack of calendar time than for all other causes combined." -- Fred Brooks, Jr., _The Mythical Man Month_