Originally posted by: drag
I mostly did it to get decent readability with mozilla. My monitor sucks and I need all the help I can get. It is also very important when making artwork with that has any print in it. Fonts are used in words and the written form is one of the major ways to communicate. Different fonts evoke different emotional responses, and there is definately a difference between the qualities of fonts. Also not having decent scalable fonts is a very crippling when trying to use gimp to make any sort of fliers or artwork, badly designed or choosen fonts can make a peice of visual communication look amaturish and ineffective, where a better choice in size, quality, spacing, style, and placement would make it look like it was made by a professional design studio.
Generally the fonts supplied with linux would be best described as good-enough for a desktop, or most programs. They are clear enough for easy reading and decent enough for everyday use. If you never gave a thought to fonts before, then it is probably not important to you. It certainly isn't going to make a program more stable or run quicker or anything like that.