Heyer is a master in her genre. She wrote great dialogues, humorous situations and conversations. Yes, her book are a little predictable [I mean her romances]. One know there will be a happy ending but what is going on between the beginning and the end of the book is often very surprising. One can also find many similarities in characters from different books. But, let's be honest - people have many similarities. And there isn't a crime that an author likes some sort of heroes. Every book have own idea, own root of the story. Most of all, there is always much fun and a nice evening with her book. 
 I have read eight novels [romances] by Georgette Heyer. I classify her books into three groups: the best ["The Grand Sophy", "These Old Shades", "Devil's Cub"], really good ["Arabella", "Venetia", "The Corinthian"] and good ["Frederica", "Friday's Child"]. I haven't read a bad novel by this author. 
 There is a mystery and a crime in "The Corinthian". It isn't typical for Heyer romances. We have two characters who are seeing a need and an opportunity for freedom, at least a little of freedom or for some time. Going in and going out from problems can be not only funny but also can get closer to each other. 
 (view spoiler)[And we have concept of disguised as a man and many mistakes and funny situations arising from that. (hide spoiler)] 
 It isn't "The Grand Sophy" with her twists and many great characters [and that end!]. It isn't "These Old Shades" or "Devil's Cub" with brilliant male-heroes who make you like those types. But you have all what you can expect from Georgette Heyer. And a tempo of the story is steady or increasing, never boring. 
 My quote from this book: 
 "You're Beau Wyndham! Well, I'll be damned!' 
 'The prospect,' said Sir Richard, bored, 'leaves me unmoved" 
 Everybody who love Heyer will see her in this immediately.