Corsican honor is a dismal, run of the mill story and I couldn't believe the author of the Corsican had written it.
The Pisani brothers are poor successors to the legacy of Don Sartene - they lack his conviction, and cunning. They are the typical mafioso caricatures. And Alex Moran is no honorary Corsican - he is a pretender and his character lacks the both depth and steel - readers are never compelled to invest in his vendetta. And the villain or the adversary is a strawman who is unnecessarily vulgar, and inspires neither fear nor true disgust. The supporting characters (Corsicans, communists, and spies)are superficial and cliche.
Perhaps the biggest let down is the fact that everything is predictable and mundane - The story, it's twists and turns, and the characters lack the quiet menace and sense of awe, which I felt constantly while reading The Corsican.
The novel does get mildly interesting at some places in Book III, but not enough to redeem itself.