It's not like mobile device vendors haven't been caught BSing the public about their products' hardware performance before. But this time, the problem isn't just something gone off the rails in the marketing department.
Samsung's Note 3 phone games performance benchmarks. Although Samsung denied intentionally rigging benchmarks, the Note 3 ships with software designed to detect when a performance benchmark is being run so that it can present a radically different performance profile to the benchmarking tool than it presents to any other application. When triggered, it changes clock speed and denies all four processor cores any power-saving sleep. Presumably, the benchmark Samsung is gaming isn't the battery life test.
Details at Ars Technica.
The next question: why lie about numbers nobody will bother with when they shop?