I agree to a point. I have had my fair share of issues with my 02 4.4 in my 1 1/2 years of ownership. I have also owned a few 3 series (2 e30's and an e36) and I will agree that the 3-series were more reliable, but that is mainly because the 3-series were stripped down compared to the X5. The X5 is a larger, heavier car with more electrical gizmos so there are many more parts to act up. I am not sure if it is BMW's most faulted car though. Talk to any current body style 7 series owners or any V-12 owners and they will probably say their cars are the worst.

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Profeshenal spellar