Really? so pentium 4 and rambus and netburst weren't heralded as the second coming but fell way short of the mark, P4 in particular being hot and having a stupidly long pipeline that gave birth to the mhz myth with amd cpu's on shorter pipelines being slower in clock speed but faster in real world.
This is also the architecture that intel were crowing about being able to get to 10ghz with, maybe with a heatsink the size of a small car and a fan the size of the average jet engine.
Bottom line is the examples all had a lot of hype behind them and ultimately they didn't pan out as expected, something that the manufacturers knew long before putting them on shelves.
And if you see that once you tend to become sceptical... Intel followed that up with the core line... gives them a bit more credibility next time they talk a product up.