New Glarus Wisconsin Red and Boon Kriek taste like fruit beers because they are made with real fruit. Is that the only way to make a good flavored/specialty beer? Of course not, but if more breweries actually made beers of that quality, I don't think this topic would be as popular as it is. Aside from saying "Wow, I've never had that before" in an ambiguous tone, there's not a lot that's memorable about most of the "experimental" beers I've had recently. Was it better in the days of Randy Mosher inspired "Radical Brewing" and 1000 IBU IPAS? Maybe, maybe not, but aside from a few experimental breweries, half of the taps weren't filled with these beers.
I don't drink flavored vodka, so I'm not in the market for most of these beers anyway, but to me it seems like that, or adding a flavor shot to your coffee. Might as well just open a bar with one beer and 50 toppings, like a sundae bar. You could probably save a ton of money that way too.