The Leaf and other small commuter cars are fantastic for people who don't give a shit about cars, and really care about the environment / gas prices. That's a great market, but it's a completely different market than the one Tesla is going after.
The Roadster is basically an electric Lotus. And there's no-one that's going to say to themselves, "You know what would make good financial sense? Replacing my Civic with a goddamn electric race car." It's not about price or energy or the planet, it's about something unique and fun, a luxury good. I expect that there is close to zero overlap between potential Tesla Roadster and potential Leaf buyers.
The Model S changes the dynamic a bit, but it's still not competing with the Leaf and other city cars. And most importantly, it will appeal to people (like me) who love cars. It's unsual, but extends beyond sports-car novelty into something that could easily be the primary vehicle for a family of 4 - or even more with the rear-facing 3rd row seat. Hell, if I was in the market for a high-end sedan, the Model S would be far and away my first choice. For about the price of a 7-series, you get something entirely new and unique in the automotive world.
Both Nissan and Tesla's attempts at popularizing electric vehicles have sensible business models behind them, they're just very different vehicles aimed at very different demographics.
They have to create a totally new production chain and make high quality cars. This is impossible with low margins, there is no way they can compete on price against this gigantic industry.
The problem is that Tesla isn't trying to make a green box for the masses. They're making luxury cars, and charging luxury prices for it. That puts them in direct competition with companies like Porche, Mercedes, BMW, etc. It's not an easy market to get into, considering the competition, and the fact that the customers who can afford their products, by and large, aren't concerned about efficiency as much as they're concerned with luxury or power.
You make the same mistake, you think in a feature spreadsheet category. Efficiency, Luxury, Price and Power.
In these categories was the first iPhone a joke and every competitor made fun of it.
Get the book and then you understand why many people here are talking about Tesla and not Nissan.
Tesla is targeting existing markets, making a product that looks pretty damned similar to other available products. They're not targeting the general public(like Apple). To compete on this level, their features are exactly what people talk about.
Also, the Roadster IS disruptive in one of those. Efficiency.
Tesla doesn't market or really care about efficiency -- and Tesla buyers don't really care about efficiency (or at least not as their #1 priority, if they did there are plenty of high efficiency 3 wheel'd electric solar powered bio-diesel gold carts sitting in junk yards that they could have been buying).
Tesla cars are about instant torque and speed, offered only by electric motors, without all the baggage and compromise that comes from an efficiency econobox (read: nerdmobile).
Nobody else is doing that. People who buy Teslas, and who are interested in Teslas, don't want 0-60 in 14 seconds but great gas mileage, they want it in 2 seconds and great gas mileage.
Now if you want to talk about a family sedan that can smoke a Ferrari, has room for golf clubs, and is practical enough to take to the beach, grocery shopping and carry 3 or 4 of my friends to a movie, regardless of the how it spins the tires? Then you are in the right conversation.