I'll chime in on this love fest.
Here's a definition of All Star gleaned from Wikipedia : "All-star (also All-Star) is a term designating an individual as having a high level of performance in their field. Originating in sports, it has since drifted into vernacular and been borrowed heavily by the entertainment industry. It can also be used for a group of individuals, who are popular in certain areas."
So a homebrew All Star consistently makes great beer and is known for it. To be known for it, one must: brew and share a lot; consistently do well in contests; and/or tirelessly share knowledge enough to help many people improve their brewing.
Using this criteria, I can say that I know of many brewers who are all stars on the local, regional, national, and global levels.
Homebrewing, compared to other hobbies, seems to be rather rich with the passionate, sharing-type All Stars at a level that seems to advance the hobby at a blistering pace. If all hobbies and political interests were so blessed with these types, we'd surely have world peace and we'd be sending model rockets to the moon! We'd be curing cancer and knitting a scarf around the world! All in the name of great beer. Go figure!