The statement in your extended quote that shots were generally 1 to 2 ev over tends to stretch credibility. 1/3 to 2/3 ev over "maybe".
As others have pointed out, a lot may depend on personal taste, final use etc. If I were only ever going to view on my computer monitor, I might want a 1/3 or 2/3 under exposure -- but I tend to print, so I prefer what my D90 provides.
If the "1 to 2 ev" overexposure is real, then I would want to compare to another D90 and/or take it to nikon to be checked out.