In my experience it will depend within the site where it is
To give an example – from my main navigation the main content pages contain the same PR but pages from those sections contain a lower PR
remember PR is not everything! so I dont worry if X review carrys a low PR, once google has found it will come back often enough and quickly index your pages, I have pages that were indexed within 10 days, live for about 5 weeks and got there PR last week with the main update
Hopefully this is of some help