The thing is, I never like the taste of samples before it's carbed. I usually love it when it's done. So I don't know if tasting it would help me any.
Okay then, at least smell it first. Smell does not always mean everything as sulfer does get let out during fermentation, but if it smells like acetone or something like that you know you might have a problem.
With tastes, you can usually at least tell if it is horrible or not. If it tastes like a sewage plant workers boot you know you have a problem.