It's a wierd sound, as in, I have no issues and sometimes even enjoy the sound when I am typing, yet hate the sound when someone else is doing so.
It's even worse for a mechanical keyboard. But there's a guy in the office who brought his personal mechanical keyboard in, which is significantly louder than our standard mac keyboards, and it's really caused a lot of people to hate him and when he's not there, to frantically hit his keys jokingly.