This is not correct, and is not WarGaming's position for further balancing decisions :p So anyone that feels Navalpride33 is speaking for us... he is not.
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Battleships are considered weak by many higher-end players. Not because they don't have overmatch potential, but because they can be kited, avoided, and farmed.
Destroyers are considered very powerful in the hands of high end players, because they have a lot of freedom in their decision-making and impact choices.
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It's not about the size of the gun, it's about how you use it~
I recorded a video showing this in action and talking about the mechanics of it in port. It's uploading now and I'll post it when it's available.