Our Jazz's steering has been heavy since it was new in 2006. I took it back to the dealer then but they said it was normal. I thought it was because I'm used to "proper" power steering i.e. hydraulic.
The electric power steering on the Jazz loses assistance just after low speeds. I find it very tiring on a longer journey and it has never self-centred, unlike my Land-Rovers do/did, but also my 2006 Civic Diesel, which is only 2 turns lock-to-lock and you just think it around a corner, however this is electric too, so I think it's a design thing ? The wife think's it's fine, but she has no mechanical knowledge, or sympathy !
Anyway, it is now an MoT failure, with a rusted sill, knocking/clicking gearbox in 1st and second, and makes a scraping noise on LH bends (possibly brakes ?). The handbrake is awful despite new rear callipers a year ago and being adjusted properly, also the discs are shot again at the back. Oh, and also, the clutch is slipping again after replacement just 30,000 miles ago. The car has done 135,000 now. We live 20ft from the sea btw.
I think it may be time ......