Yes, the car is beautiful. Yes, it is efficient despite its fairly limited range. It is very difficult to take this car seriously as a $130,000+ high performance sports car with a tiny three cylinder turbo motor. 231 horsepower from the gasoline motor simply does not cut it in this price range. Talking about the 154 horsepower per liter will not distract performance enthusiasts from that reality.
With Porsche taking hybrid performance to the extreme in the 918 Spyder the i8 feels underwhelming. Especially considering the all electric Tesla Model S sedan offers higher performance without even needing a three-cylinder crutch. Is it beautiful? Yes. Is it a high performance car? No.