We rented a VW Passat Estate in France this year. It's a spacious comfortable car, but the model we got was very underpowered. I can't remember what engine size we had, but my dh kept stalling it - and getting soooo frustrated with it.
It also had a weird parking brake, operated by a button on the dashboard that took a lot of working out, as did starting the damn darned thing - something about having to have your foot on the clutch whilst turning the ignition - which took dh ages and ages to work out whilst we stood waiting at the end of a very hot carpark with all the luggage. Apparently his 'O'level french many years ago is not terribly helpful when trying to translate a car manual from French!!
We've currently got a volvo 850T5 estate - comfortable, spacious, big boot, side impact protection systems make it very very safe, and it's been a stalwart car for at least 6 years. It can take 2 adults, 3 children, all the luggage for a fortnight's holiday and four bikes on the roof, and still overtake other cars with ease (though not when I am driving).
We still have it as our second car, but have had to get a bigger car as ds1 is now taller than me and didn't have any legroom at all in the volvo. We've now got a Mercedes E240 Estate (I had to run out and check the back of the car - ) which is amazing - loads of legroom in the back, and more space across the backseat too, which has reduced the fighting amongst the ds's. The boot is enormous - dwarfs the volvo - and because the engine is a bit smaller, it's actually more economical! It's a big car, which did take some getting used to, but I love driving it now.
Surprisingly, it wasn't very expensive second-hand either - for some reason people don't want the model and engine size combo that we've got - they want the really powerful AMG engine - that's so thirsty that you basically end up driving from petrol station to petrol station - and it cost you more in the first place!
Reading this back, I sound like a bit of a petrol head - living with 4 males must be rubbing off on me!!