Possibly the most practical car I ever owned was the VW Passat estate. I have owned 3 estates, the Passat was streets ahead of the others for usable space and ease of loading.
Never owned a Volvo, so perhaps an incomplete comparison.
The most unrelaible and problematic car I ever had posession of was a 1980 VW Rabbit (Golf) Diesel in California (in 1993), it was old and had problems, but the biggest issue is that every garage refused to work on it. I think at that time diesels were a bit of a rarity in California.
The biggest problem was the the throttle would jam open and she would then accelerate very slowly in a cloud of black smoke. But if I braked hard enough the revs would drop to almost nothing and the engine would threaten to die, so then pedal to the metal, jammed throttle and off we go in another cloud.
Not acceptable in California in the 90s.
My most fun to drive and car with most charachter was, without doubt, my Mini Clubman. Also very practical for a small motor.