Some of the merchandise in Carrefour is cheap, some quite good. You really need to research before you buy. I usually look for online reviews before buying anything expensive there. If there are no reviews to be found, at least stick with brand names you know and trust.

I'm with you about the parking, though. It seems like so many places here have underestimated the city's growth and the need for parking. But I've seen the future of Doha (i.e. I've lived in Dubai) and can tell you it will only get worse. Get used to it.