I'm amazed at how 90% of the replies in this thread are about the turning radius. I'm pretty sure that is not the reason it made the Consumer Reports least reliable list this year.
I'm surprised that no one has a CR subscription and could elaborate on CR's reasoning...
Just out of curiosity, I looked up the turning radius of the ST versus my BMW M235i (a relatively small car), and both cars are 35 feet. My 1st gen Mini is also 35 feet, though the steering ratio is a bit quicker than the ST. Mini is 12.9:1 while the ST is 13.6:1 (both are extremely quick).