And if we're dealing with a field where there is no objective way to verify a claim, then any claim should be viewed as mere opinion (a more or less valid opinion depending on how mainstream it is). As for fields where all claims are in the realm of opinion... they're not actually part of the scientific family.
Or take the 4th grade test about dinosaurs[1]. Objectively, we can't verify if the world if thousands or millions or billions of years old, and we can't verify if dinosaurs lived concurrent with humans or not. We weren't there. There is evidence, and how we interpret the evidence, and yet the test features a rather forced interpretation of the evidence. Now, numerically there may be a lot of people all over the world who prefer the fundamentalist interpretation, even if they are accredited scientists in universities. In a completely open environment, this opinion would get more weight than it deserves, a weight that does not represent its true standing among scientists who understand all the different implications of the evidence.
From the article - "They argue that the current journal system slows down the publication of science research. Peer review rarely takes less than a month, and journals often ask for papers to be rewritten or new analysis undertaken, which stretches out publication for half a year or more. While quality control is necessary, thanks to the Internet, articles don’t need to be in a final form before they appear. ... “We want to go after peer review,” CEO Toni Gemayel told us."
And I am saying, quality control is essential, and yet an open internet-based process would mean a lot of people with pet theories they want to drive could game the system. I agree with the poster who wrote that you need to take into consideration the author and his caliber even in scientific journals -- the quality control problem is a problem already today really -- but the effort necessary to get an article to publication raises the quality somewhat (and in turn prestige of relevant journals).
You realize that your argument is essentially "the blogosphere is not real journalism", right?