I personally went AWD because that "X-drive" badge on the trunk is Super badass!
Actually, I went AWD because my Camaro is RWD, my Harley is RWD, my outgoing lease was FWD, and I have come to really appreciate my X5D's ability to be both smooth and capable is a wide variety of weather conditions.
I also had a turbo I-4 AWD car about a decade ago (Eagle Talon TSi) and found it a BLAST to drive. I hoped the 228xi would build off that same driving experience, and so far I've been very happy!