I agree the Jazz can be very quiet and refined, but at the other end, occasional pedal hard to the floor, its rather loud and unrefined. Fortunately that is not the norm for the typical journeys I do in the Jazz.
Whilst the electric drive gives it an immediate quick pick up from the lights, in reality, it can hardly out accelerate an enthusiastic white van man!
Over the past 4 years my cars have included 2 BMW's with the 3 litre 6 cylinder engines and I just traded in my 5 litre V8 SUV with 550bhp(for a Volvo, as age requires more sensible cars) , all of which could deliver some serious off the line acceleration and "sporty" performance across all speeds, which the Jazz obviously can't.
The thing is with my Jazz, not once did I not want to jump into it or feel short changed when the "performance " cars were sitting next to it on the drive. Over 2 years, its proved to be the best small car I have driven or owned, perfect for short around town trips, yet perfectly capable on longer trips when needed, combined with Tardis like interior space/practicality.