You will probably be surprised to know that that particular iBook line was very popular. It helped Apple regain credibility and revenue. In the late 90's, those things were much more stylish than the beige black POS's that were PCs. This style was also mimiced in one way or another by nearly every computer company.
just because it was popular, doesn't make it good design.
i thought they were ugly back then, they look even more ridiculous today.