PR only matters to me when it's good! LOL. When it's bad I tell myself it's irrelevant.
When I saw two new category pages get the same PR as my home page I took that as a sign I'd really done a good job with those new pages, and maybe the rest of my site could learn from them.
No idea what PR is based on these days - it's certainly not links as neither of my two new pages have any external links and only as many internal links as other category pages on my site.