We haven't noticed any wear issues with the tires...
Mama_jo and jdavid2 those issues sound pretty awful. I too would certainly be considering a different vehicle. I received an x1 as a loaner while the x3 was in the shop and man what a difference in steering feel. Felt more like the old x3. I understand the x1 still has hydraulic steering and the whole thing is based on the e90 platform. I would give up a few mpg's to have that in the new x3.
Have the dealers check out the fault codes but it would take much smarter folks than me to come up with other explanations for what you guys are experiencing. Good luck.