It is one of those book which I give a bit better rating for, because of their idea/potential. I am a little disappointed that Mary Balogh wrote rather short and simple story. It could have been so much better. 
 It could have been a really good witty Regency romance - the characters and a main idea were brilliant. But there was little humor here and in the love story there was no place to more believable evolve of feelings. It was too fast, there was not enough days. It should have taken weeks at least. [E.g. compare it with A Civil Contract by G. Heyer or The Semi-Attached Couple by E. Eden. There are a little different marriage stories but one can see how such relationships need time] 
 It could have been a marvellous study of those times, an aristocracy, a family and people of upper class - again, the characters and the family issues were genial. It wasn't a black/white world. The characters were complex, interesting. How family matters went was even surprising. 
 But Mary Balogh used her concept as she wanted to. So, instead of a wonderful historical fiction with a good romance I have read a pleasant short novel. 
 Yes, I had a nice time and yes, I will try another book by Balogh because I see that she could write an interesting book. 
 [By the by, I would like to read a version of such story when a heroine is truly a quiet mouse. It could be really good.]