I spaced on Lexus.
However, your singular experience does not define an entire brand of reliability and cost of ownership.
Looking at new cars TCO, KBB lists a Volvo as the lowest cost-to-own luxury car from 2015MY.
http://www.kbb.com/new-cars/total-cost-of-ownership/
Also check out:
http://www.edmunds.com/tco.html
Looking at the Volvo S80 it costs $45,408 for 5 years with $5515 in maintenance and repairs. The Lexus IS 350, the S80's counterpart, costs $46,207 over 5 years, with $7,810 in maintenance and repairs. This happened to be the first pair of vehicles I looked at, feel free to argue it the other way, I'd be interested to see numbers drawn from a broad source that support your case.
Furthermore, reliability does not define cost of ownership. Reliability/maintenance costs != TCO. A car that's cheap to repair might have high insurance and registration costs, cost/depreciate more, or consume more fuel than the less reliable car. The costs may be more visible, or feel higher, if they're related to repairs, but that in and of itself doesn't mean that the car is cheaper to own.