There are a number of cars I wouldn’t recommend, based on what I hear from my informal network and from published stuff, plus personal experience:
-For luxury cars, Mercedes, despite their image as this rock solid piece of equipment, they aren’t, getting a good one is luck of the draw. They are better than they once were, but they combine complicated systems with poor quality control, and you pay through the nose for it (friend of mine was the head of service at one of the big MB dealers). Almost everyone I know that has bought one loved the car and the way it drove, but ended up regretting it over time.
-Anything made by Fiat. I love their commercials, but apparently they aren’t any better than the old “Fix It Again Tony” days.
-Cars coming out of Chrysler, I have read all the things about how their quality has improved, but I would be very leery of buying any of their cars, my informal network, that includes mechanics, and I have heard that their quality control is not what it should be. It also tends to be either love or hate them, those that get the good ones love them.
-Audi is another one I wouldn’t buy, they make some nice looking cars and they drive well, but from what I have heard and seen, they are not the most reliable car, and when you need things repaired, it generally costs a lot. Yeah, I have seen the JD Power surveys, and I don’t trust them in this case, have heard too many horror stories from people I trust to have that sway my opinion.
-Ford Fusion, especially the hybrid, has caused a lot of grumbling, all kinds of complaints of things breaking, and worse, needing multiple trips and still not working right.
-With Nissan, people tend to like the Maxima (I drove one as a rental not long ago, decent car), and I have heard mixed stories about them. I wouldn’t buy a used one that is more than a few years old, they had serious reported quality issues for a while and they didn’t resolve them until about 5 years ago or so. I have also heard bad things about the Murano, including that it tends to eat up its transfer case for the AWD models, but for the most part people seem to like the rest of the line.
-Mitsubishi is a stay away vehicle, I have heard nothing but bad reports on them, apparently they haven’t improved much since it was revealed they hid major problems, and from those brave enough to buy one, I hear about all kinds of problems, most troublesome transmission issues and electrical issues.
-Jaguar (not that I have the money for one).Pure prejudice, based on the horrors of British cars from years past, especially “Oh mighty God of darkness” Lucas electrical system.