Michael Freeman, the author of Mastering High Dynamic Range Photography, takes another look at the HDR technique in this blog article: http://thefreemanview.com/techniques/hdr-revisited/
Mastering the Art of High Dynamic Range Photography has become one of the foremost reference books on this technique. However, Mr. Freeman had stopped using the technique several years ago, in favor of another multiple exposure technique, known as exposure fusion, with which he feels it is easier to achieve natural looking results than with the HDR/tonemapping process.
Mr. Freeman's article has some useful illustrations, and it reflects his disappointment with the multitude of poorly executed HDR images that one finds now all over the Web. Recently, I have been noticing quite a bit of poorly done HDR in low-budget marketing materials.