Hi Dusan,
I'm in agreement with Alex here - there is plenty of reason why Google would pay little attention to many web directories, but the primary reason today is going to be a lack of good content. After Panda, pages are being held to a higher standard for the quality of their content, and web directories rarely include any original content at all.
For SEO purposes, being linked to from old fashioned directories isn't a bad thing, and could either be of minimal help, or a little bit helpful. However, it's not a link building tactic that you can really rely on anymore.
The PageRank advice is true too: at best, toolbar PR is a good indication as to whether there's something really wrong with your site (i.e. you lose your toolbar PR overnight, or it drops from very high to very low). At worst, it's misleading and outdated, and no indication of how well you can rank.
Cheers,
Jane