I would never criticize an author, because producing a work of fiction that anyone will pay money to read is an astonishing achievement.
Cooper was prolific as hell, but all I have read is The Last of the Mohicans - a long time ago.
Mark Twain, of course, has the bona fides to critique a fellow author. I have heard of his famous humorous and devilish critique of Cooper ("Fenimore Cooper's Literary Offenses"), but never read it until Right Wing Nation posted it today.
It's a powerful manual on what not to do in fiction writing. Thanks, RWN.