Pageranks...useful or useless

I’ve used 2 different pagerank tools now and I’m confused. I entered my company domain into the pagerank tools and both times got a score of 0/10 which, from what I can gather, is very bad indeed.

But, if I go to google and search for ‘Asset Management’ (I work for an Asset Management company) the company appears on the 4th page.

Perhaps it’s the tools I was using (links below)

http://www.prchecker.info/check_page_rank.php
http://www.iwebtool.com/pagerank_checker

Or perhaps these pagerank tools are useless. Any one had similar experiences with them. Is it only a few developers who use them or know how to use them.

Are pageranks tools useless or useful?