I find it amusing that these features almost always show a list of people I dislike.
If I know a person and they're on Facebook, more often than not I've already 'friended' them. The friends-of-friends which are left tend to be those I'd rather avoid.
I think that if a friend really wanted to suggest a request to me, I'd rather see it in a more personal medium. Otherwise, why haven't I already thought to add them?