It really depends on the source of the bad review. There is page rank and then there is particular page rank.
What people fail to understand is page rank is not proportional. A page rank of 1 can be worth a million more times than page rank 10.
For instance, (I’ll make up some numbers for example)
Page rank 10
RoadRunner.Com
Page rank 7
Acme.Com
Page rank 1
OK most people assume the distance between Acme and Coyote is 10. No it’s almost certainly not
As page rank goes up the worth of that rank changes much higher.
So a page rank of 10 may be worth 10 points in the google algorithm but a page rank of 7 may be worth 20,000 points
A page rank of 1 may be worth 1 million points.
This is one of the reasons Google gets slammed. As if you have a high ranked site, your page link is worth MUCH more than a lower ranked site. So a link form Time Magazine or USAToday will propell your site up. While 50,000 links from 50,000 rank 10 sites would be worth only half as much as one link from a page rank 1 site.
Then not only does a site have a page rank but each page that is indexed has it’s own particular rank. So USAToday may have a page rank 1 and the page the review is on will be page rank 82.
Remember page ranks are for keywords. So you can be ranked high for some words and low for other words. Remember in SEO words can mean individual word or phrases.
So if this review is in a major newspaper, it probably has a huge page rank and to push it down you are going to need an opposite review in other site of equal status in Google. Getting reviews on other sites aren’t gonna help if their page rank is low.
What people fail to realize the difference between first and second place in a Google result can be tens of thousands of points.
And Google feeds points into an algorithm it is constantly changing and updating to make better.
Also links only count if they are followed, many blogs and newspaper comments (Wikipedia does this as well) are prefaced with a “No follow” tag that means the Google Spider won’t follow the link and index it. So it counts for nothing
SEO changes constantly so even if a method works it will eventually be tweeked.
Look at Search Engine Watch (dot) Org for other ideas