The leaked pre-release Bulldozer benchmarks accurately reflected just how poor a CPU it really was. A lot of people didn't want to believe it, since it was hard to believe that AMD would release an architecture that was in many ways worse than its predecessor. This was exacerbated by the fact that JF-AMD was going around telling people not to believe the leaked benchmarks and to wait for release.It kind of is though. I remember the pre-BD times in this forum when hype for AMDs new architecture was just as fevered. AMD even had someone from their marketing dept. (JFAMD) who posted regularly (he let everyone know about his job so it wasn't something shady) that further fanned the flames.
With Ryzen, the leaks are far different and indicate a CPU that, by and large, is competitive with Intel's Broadwell-E offerings. Possibly worse OC depending on who you believe, and probably inferior AVX performance based on what we know about the architecture compared to Intel's newer chips - but competitive overall in a wide variety of applications, both single and multithreaded. Sure, it potentially could be a disappointment - but history teaches us that credible-appearing leaks that correspond across multiple sources are generally correct and that people who try to explain them away are usually wrong.