Larry, thanks for your response. I appreciate the fact that people who find their new cameras defect free are less likely to post than others. Indeed, my D200 has never given me a bit of trouble and I hope for similar luck for the D7100.
However, my anxiety about this has some basis beyond my nervous temperment. I'm retired and enjoy spending timereading DPReview and Thom Hogan's informative blog. I took the liberty of asking him his opinions on the subject and he was kind enough to quickly reply. A defect rate of 20-40% in the D800 and late occurring issues in the D600 is not confidence building.
These issues seem more related to slipshod assembly than true design failure and I'm hopeful Nikon addresses the problem.