I guess that hardly makes them unique or even particularly interesting, in my eyes. There are a lot of brewers out there experimetning with many different styles. And a lot of them do a better job.
While I definitely appreciate breweries that can do multiple styles well, I'd rather have a brewery that knocks one style out of the park rather than one that does a lot of different styles without any particular distinction. And that's where I've found myself with Lagunitas.
And McDonald's sold a bajillion hamburgers, while Britney Spears sold several million albums. Appeals to popularity don't really cut it.
I'm not saying you shouldn't like Lagunitas. There's stuff I like that many others don't. I'm just saying a) that they don't work for me and b) the popular appeal is silly.
-Steve