I am not familiar with how the pixel are arranged on a plasma HDTV. However, on a LCD HDTV the spacing between pixels is greater than that of a PC monitor. This results in "fuzzy looking text". It's also a way to reduce the cost of manufacturing a LCD panel of an HDTV. If the spacing in between each pixel (pixel pitch) was less, then the size of each pixel would need to be larger to maintain the same LCD panel size.
I would expect the pixel pitch is rather large in a plasma HDTV as well, thus leading to "fuzzy looking text".