I think that the way to look at hybrids these days is not to think of a Toyota Prius, but rather a way to not only make cars more efficient, but also possibly increase performance. Ok, so it is overhyped and it doesn't perform as well as it should, but in a car like an X5 where driving dynamics isn't #1 priority, a second electric engine could be welcomed. Fuel economy, low end torque

, less emissions would be welcomed.
If you go to YouTube and search for a test they did with the Lexus LS hybrid, you would find that a V6 engine could have the performance of a V8 while saving gas.