My 07 X5 has been completely problem free, it's the best SUV I've ever had including Range Rover, MB, Lexus etc.
I think these forums give a very distorted view of problem vehicles in that people with problem cars are more likely to complain about them in these forums giving a very distorted view on the percentage of problems.

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Porsche 996 Turbo (Ruf 550)
Porsche 993 Cab.
Porsche 997 GT3
Audi A8
BMW X5 4.8 White, Black Napa, Sport, Technology, Premium, Prem. Sound, Cold Weather, Rear Climate, Multi-Contour, Sirius, HD Radio, Running Bds., Bamboo