i've had a few on that list and am sure they're all good. but the fact all 50 come from just a few states leads me to believe this 'study' or 'ranking' is more than a little skewed. the fact there are none on there from this brewery (http://realalebrewing.com/) is another hint that whoever put the list together didn't really do a thorough search.
In agreement with BB! No beer expert for sure and seeing those Sierra Nevada's in the top 10 tells me this isn't kosher! The SN is the only one I have had on this list!
And Pavy is correct that the Rogue Dead GuyAle should be GL's official beer! Anybody ever try it?