Most of the time, text justification (right and left aligned) does not look good for web pages. This is, because webbrowser do not hyphenate long word. Text justification may work for English text because on average words are not that long. It mostly sucks for languages like German and in situations when text areas are small (captions of pictures within <gallery>).
For an example, see http://commons.wikimedia.org/wiki/Nuremberg#Johannis_Church_Cemetery (first row, third and fourth image).