Burton made good boards for a long time. A decade ago, Burton was ahead of the pack. It doesn't appear that way now because other companies are stepping up their game. I wouldn't recommend mid to low range boards from Burton, but I see nothing wrong with their high-end models. Brand name recognition is the reason why they cost more, and the same can be said about Nike.
Hating Burton because they are mainstream is something I often hear from "hypbeasts" here in trendy California. You shouldn't dislike something if you never tried it.