I disagree even though I'm absolutely in favor for finishes. But in my opinion not every finish is more impressive than any decision. A lot of finishes are lucky shots with one or both fighters swinging for the fences and one strike luckily hits the right spot. Relying on luck doesn't impress me that much, in those cases I find St. Pierre's sheer dominance more impressive. A different thing are finishes were the fighter really is aware of the fighting situation, in control of the situation or at least of himself and consciously puts the other guy away (i.e. Anderson Silva, submission wins generally).
I don't think there's anything such as a lucky shot. Fists are thrown with the intention of hitting someone's chin. If you can finish your opponent it sends a clear message.