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Rod bearings have been somewhat of an issue on M motors since the late 90's w/ the e46 M3 and the S54 engines. It's crazy to me that they haven't gotten it right in nearly 30 years...which leads me to believe, it's not a mistake, or an error in engineering. It leads me to believe that maybe BMW thinks RB's should be replaced as a consumable item - or - these engines were designed to operate within a certain environment with minimal variability.
In addition to tight tolerances, I think maintenance, oil, and environment (closely related to oil) all play a key role here. Warm up your car properly to get the oil flowing, choose the right oil for your application; (in a colder climate, probably want to go w/ a lighter oil)
I think if you do those things, from Day 1, and this is why maintenance records and frequent oil changes (every 5-7k, not 15k miles) are so important, your RB's should last a long time.
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