It’s not really that Kraken is OP, its that a lot of the hunters are not effective vs Kraken. All of the assaults are at their worst vs a Kraken. Like Torvald is a pretty hard counter to Behemoth, there are no assaults that are hard counters to Kraken. Kraken can keep its distance and still near full damage with its abilities and ranged attacks. No other monster has ranged basic attacks. No other monster can body camp a hunter from a distance. When a hunter is incapped it is almost impossible to revive the hunter without making the kraken leave due to incoming damage. The kraken will just hover and fly circles around the hunter and finish the hunter off.
The recent changes to make CC more effective vs Kraken have been pretty negligible from a hunter’s perspective.