After skimming 12 pages of "cars I would never buy again", these are the cars forum members have sworn to never buy again: any GM, any Ford, any Chrysler/Dodge/FCA/Jeep, (so basically any American made car/truck), VW, Audi, Volvo, Subaru, Honda, Toyota, Hyundai, Kia, BMW, Mercedes, MG (anything British), Renault, Peugot, Saab, Fiat, Jaguar, Nissan/Infiniti, Mitsubishi, Opel, Vauxhall, and Yugo.
That leaves Mazda, Porsche, Lexus, and Acura as the only widely available cars we should buy. I've had 3 of those 4 and can vouch for their reliability.