I am quite familiar with the whole Fisker saga since one of my relatives bought a Karma last year. I tried to talk him out of it. When I test drove the car the software was extremely buggy, not even alpha quality IMO. The entire drive the car kept going "bong bong bong" because it was stuck in some self parking mode that the dealership couldn't get it out of. The car was sexy looking IMO, but it had a lot of serious issues going for it too.
The car is big yet the interior is quite cramped with the huge battery occupying the entire center of the car. Acceleration was nice, up to around 30-40MPh. The software on the center touch screen looked cool, when you could see it, but was quite buggy and not easy to use, especially while driving. For such an eco-friendly car it also only got 20MPG on gasoline and got a combined EPA rating of only 50MPG. The car is quite heavy, over 5300LBS.
Fisker's problem is that they outsourced their engineering. The drive train was done by Quantum Technologies and the battery by A123 systems, both heavy investors in Fisker. Fisker promised to sell 15-20K Karmas which A123 bet the farm on.
Then there were the fires, for one of which the cause was never explained. While the battery wasn't the cause the perception was there. Next was the Consumer Reports debacle. The car completely died early in their testing and it was determined that the battery was defective. This resulted in a battery recall which was the final nail in A123's coffin leading to their bankruptcy. A123 was already in big trouble since Fisker sold far fewer cars than they had promised. In fact, even though Fisker hasn't made a single new car since July of last year you can still find plenty of unsold Karmas at most of the dealerships.
My relative loves his Karma, but the car has been in the shop way too many times in the last year, sometimes being towed in and some of the issues have been rather serious. Other issues are just unexplained.
Fisker was all about image and styling using outsourced technology. When some Chinese investors looked into the company they realized that they didn't have all that much in terms of technology, and in fact their technology was rather mediocre in many ways and needed some serious refining. There were issues between the engine and generator, plus they used two synchronous motors in order to get enough power to move the car and to help overcome torque ripple issues (from what I gather from their patents).
For a first car from a new car company the car was overly ambitious and was far more complicated than I think they realized. Because it was so late the car was rushed to market with a lot of serious issues and inadequate testing. The car underperformed in almost every way. The federal government cut off their loan before they could draw it down all the way.
Their next car, the Atlantic, was to be built in a shuttered Delaware factory but that car also suffered from a cramped interior.
Fisker also burned through a lot of cash without a lot to show for it. They never did anything with the factory they purchased other than stick it to Delaware.
A lot of people compare Fisker to Tesla which is an apt comparison. I am even more familiar with Tesla, having bought a model S myself. Unlike Fisker, Tesla developed their own technology for their Roadster. They developed the battery and drive train and perfected it, once they moved away from the problematic 2-speed transmission.
Tesla's battery solution was to use inexpensive off-the-shelf batteries and to perfect their battery management technology. Unlike Fisker, who uses an expensive custom battery pack Tesla's battery packs are stuffed with over 7000 18650 cells. The 18650 lithium cell is about as standard as it gets. Their drive train is much more compact than Fisker as well. They use a single induction motor that provides about as much power as the pair of motors Fisker uses but without requiring expensive rare-earth metals. Tesla's motor has no magnets in it.
While the Fisker Karma and the Tesla mode S are about the same size on the outside, the inside is a whole different story. Tesla's battery sits entirely underneath the floor and their motor and inverter sit just behind the rear axle. The result is that there's a huge amount of space inside the car. Since there's no engine in front, that space is available for additional storage. Tesla also spent years perfecting their batteries such that they're also manufacturing batteries for other car makers.
Tesla also spent a lot of time on the software. While it hasn't always been perfect they have been quick to fix various issues that have cropped up. I personally have not run into any software issues with the car. The only real issue is that they have disables much of the power management while they fix it so it draws more power than it should when not in use.
Tesla also was not as ambitious as Fisker. The Fisker Karma has a number of features which Tesla declined to implement which was probably a good thing. It meant fewer problems while they got their model S out. One final big difference is that Tesla has started to be profitable again as they manufacture about 500 cars per week.