Not at all. AMD CPUs definitely benefit from lower timings. And what crazy speeds? Are you talking about crazy bandwith? Because latency IS the speed.
AMD was seriously hoping that DDR2 latency would be alot lower by now, and so that they would never have to sacrifice bandwith for speed. But, that never happened. As a result, AMD chose to go with extreme memory bandwiths (DDR2 667, 800, ect.), because they figured, "****, if we can't get good timings at all on DDR2, might as well take the bandwith increase and slightly increase overall performance".
AM2 was definitely more promising in AMD's eyes a few months ago.