Pages is better than Word ... to a point. Once you go beyond the critical mass of deep features, Word trumps it.
Same with Numbers. For simple stuff it trounces Excel, but if you need any of Excel's deep power features, numbers leaves you flat.
Keynote is wonderful. Just for the ability to give a presentation without a template that everyone has seen 7,000,000 in powerpoint alone makes it look like you spent more time on it. However, the newer power points have copped a lot of Keynotes tricks and is catching up to it.