No matter who fights The Kraken, you can always count on its massive scale. The enormous teeth threaten all who tread near its mouth, but that only matters if you can get that close. Most attacks from The Kraken occur on the open sea, but as shown in Clash of the Titans, it has been known to devour port city areas.
Unfortunately for bystanders, The Kraken is just like any giant monster that takes countless innocent lives. Yet, the one characteristic that makes The Kraken unique is that is must be summoned. In Clash of the Titans, The Kraken is released by Zeus. In Pirates of the Caribbean, The Kraken is summoned by Davy Jones. Yet even those in power seem to have limited control over the massive beast.
The Kraken is one of the most deadly sea monsters around. If you can keep away from those in control of it, you should be fine on your voyages across the sea.