Now before I even start, I just would like to say that there are plenty of great beers being brewed today that are extract beers. Every year at the AHA nationals there is at least one beer that places that was brewed with extract.
That being said, it certainly is not something that you would expect from a major brewer like Guinness. While doing some research today on water chemistry for porters and stouts I came across a thread on ProBrewer discussing the affects of Chalk on dark beers. Buried deep in there thread was a great post about the history and composition of Guinness. A couple key interesting points:
Guinness OG:
1840: 1.082
1940: 1.054
Today: 1.038; FG: 1.007
Budweiser today:
OG: 1.044; FG: 1.010
What that means is that in the past 150 years Guinness has basically cut its alcohol content in half. Actually to the point where the Great American Lager is actually string than the “Dark” beer Guinness. The poster speculates that the cause for this is two fold. Firstly it was done for tax purposes. Brewers are taxed on a volume of alcohol rate. That is to say that higher alcohol beers are taxed at a higher rate than a lower alcohol beer given equal volumes. Secondly he mentions that the Publican lobby is strong. Lower alcohol equals more pints purchased and less stumbling out of the pub.
The second and most surprising point is the following
“Today at St. James’s Gate, Roast Malt Extract (RMX) and Mature High Gravity extract (MHG) are used in the brewing of Foreign Export Stout, draught Guinness, and Guinness Export Stout … What is common to all Guinness stout brewed in any location is the inclusion of dark RMX … and MHG”
–stated plainly by a retired Guinness employee
Translated that means that they no longer mash grain at the St. James Gate Brewery in Dublin. They take the extract that is created for use worldwide and use that to brew. Its important to note that brewery tours at St. James Gate ceased in 1972.
I will say this: there is no beer on Earth surrounded by more confusion, myth, unsubstantiated opinion, and pure BS than Guinness stout
Could not have said it better myself.