Though they may lack visual impact, they may make up for it by containing good information that benefits others in the design world. We realize the spelling of some words may be different in other parts of the world. Such differences are considered when reviewing a site. Sometimes it's easier to know what the criteria is, if you know what is undesirable. Poor use of typography.
Nothing kills the look of a well designed page than inappropriate use of type.
Often times a site may have great content, but a graphic is used that destroys the overall appearance. Type that has exceptionally overbearing perspective. Color choices that make type vibrate and clash. Really bad calligraphy. Calligraphy is an art form in itself.