My TV room is flooded with sunlight during the day, and plasma sets tend to have bad reflections in such rooms due to their glass front panel. But I'll agree that viewing angles are DLP's achilles heel. Plasmas may also have better contrast, which gives a "pop" to the picture.
But I can rationalize that I'm doing my part for the planet, since the DLP is Energy Star rated and uses about one-fifth the energy of that plasma.