That is a common sight on the Jazz. I cheacked to see if other owners have had problems with leaks and steamed up windows and many have. I don't know about the handbrake issue, but I would also be completely put off a new car with either issue. I drive an old Hyundai and would be upset if it leaked.
With the arrival of a new baby the Honda Jazz Sport was the obvious choice. Apart from 2 faults the car has been great. The handbrake is useless so we always have to leave it in gear when parked. Despite returning it to the dealer within the first week and expressing serious concerns they said it was OK. The other fault is steamy windows. It takes an absolute age to demist and therefore dangerous if you don't sit and wait 10 minutes for it to clear. Again Honda said this was normal. Overall great family car spoilt by niggly, but dangerous faults that Honda say don't exist!
You must be unlucky! Don't do the lottery - you have no chance of the jackpot if you got a faulty Jazz! We've had ours for 3.5 years and 36,000 miles. We have had no problems with the car at all - other than someone crashing into it in a car park and driving off! Not the cars fault though.
The pollen filter can cause the car to steam up - that is a problem with many modern cars. The remedy is to turn on the air conditioning (assuming you have it). Failing that, remove the pollen filter which is located behind the glove box (4 screws) and chuck it away.
Our Jazz is brilliant. Does everything asked of it, including a 500 mile journey with 2 kids in the back getting 50+mpg on the motorway. We have no plans to get rid of this car even though it's 4 years old now.
I would agree with the post on 7th May - you really must have been unlucky. Yet another survey out this week, that puts the Jazz 2nd for driver satisfaction in the UK (beaten only by the Toyota Prius). We have a 3 year old Jazz (and 4 year old CRV) and it has behaved perfectly. I will admit the handbrake isn't the best, and does need to be applied with care, but then I was taught to never rely on the handbrake - I have passed the advanced driving test (Institute of Advanced Motorists) and when taking tuition, was always told to leave the car in gear when parked.