I have a 2004 Avensis 2.0 D4D.
Perfectly serviced, not ragged (i.e. warmed up before giving it any beans) and from a manufacturer that has a lot of people believing they are up there with the best for reliability.
Since having it (8 months) the starter motor has gone, and I have been through 2 sets of injectors before reaching 55k. Luckily it was under warranty, as the injectors were almost £2k a set (including fitting).
Yes, I get good fuel economy, but driving a slow car (and anyone who says diesels are getting near petrols for performance is deluding themselves), getting diesel over my hands whenever I touch a fuel pump trigger, higher costs per litre, tractor sounds under the bonnet, and very temperamental and expensive to fix engines - all add up to me buying a petrol car next, regardless of what tax hikes they put in place.