Is Submitting Your Site To PR 0 Site Is A Waste Of Time?

Is Submitting Your Site To PR 0 Site Is A Waste Of Time?

There is one very disturbing question that is coming in my mind about Directory submission process - Is Submitting Your Site To PR 0 Site Is A Waste Of Time? As I have been submitting my site to various directories from a directory list since last one month or so. Many of these directories are having PR 0 with only a few having PR 1 and above.
One thing that I have noticed during this process is that Those sites having PR 1 and more take a lot of time in fact months to approve the listing. But those with no PR take mostly a week to approve the listing. So the question is is this a good thing submitting on them. Will they help me improve my ranking and increase traffic to my site. Will Google count thse links of my site on PR 0 Directories? 
Out of this query and researching on the Internet after a lots of pain I got a few answers - 
Some says do not worry on PRs of the Directories. The main thing is the that you should submit unique Title & Descriptions for each submission. If you are using same set if Title & Description in each submissions then Google may not like this as a case of duplicate Content. Google may count the hundreds of the listing of your site on those directories as only 4-5 backlinks to your site. And regarding the PR of the directories, you never know what will be the PR of those sites after a year or so. It may be that after a year you will see that those sites have become very popular and their PR is also increased.  At that time you will not feel like you have wasted your valuable time and effort in submitting to those PR 0 sites a year ago. 
And above all every new site has a PR 0 at the start. But gradually after time will pass they attain a good PR(Like when your site was also a new one with no PR when you started your site.)
There is also a very good valid result out of my research that - look for the sites already listed in the category you are going to submit your site or in other categories too. If there are good big websites listed there, then be sure that there is waste of your time and effort. 
One another thing is that do check whether the pages of the directory where you are looking for a backlink for your site are getting indexed by Search Engines, otherwise you are wasting your time. You can also ping the pages where you can see your link live. This will help you in indexing your site in Search Engine database.
Also check whether the directory you have selected for submission will list your site in the directory for a long time or not.

You can also go for Article Submission/ Article Marketing, Blog Commenting, Forum Discussion with your Signature and Link Exchange for quality backlinks for your site. Do not forget to submit your sites link to all the search engines.