Japan definitely makes the most reliable cars on the market, however they're not always the most powerful, striking or cool cars. They will, however, never break down.
German cars tend to be fast, fun and luxurious, with not quite as reliable a track record as Japanese cars.
American, British and Russian (Lada? lol) cars are pretty weak as far as reliability goes.
From what I've read Korean cars (namely, Hyundai, moreso than Kia) have made huge strides in quality and luxury in recent years. Hell, the hyundai Veracruz just beat a lexus in a motor trend head-to-head.