I would guess like many readers I came upon this writer's work when he began receiving international acclaim for his work, "Amsterdam", in 1998 when the novel won The Booker Prize. I have read his work that has been published after that tale, and now have been going back to his earlier work, a decision that can be very rewarding, or quite the opposite. I suppose expecting earlier work to be less mature or skillful is reasonable, but there are also writers that appear with an initial work that is very good or even excellent, and they manage, with some exceptions, to keep the quality of work very high. Other writers peak with their first book, there are no rules.
"The Comfort Of Strangers" is the second novel that Mr. McEwan published, and it would be fair to call it more of a short story. I don't know what divides a short story from a novella from a novel; it appears publishers use the terms interchangeably at times. From the two earlier works I have read, this book along with, "The Innocent", Mr. McEwan to date, sits in the category of writers who get better as they hone their craft. This may appear to be the normal course of a writer's development, but we all have read otherwise.
My primary complaint with this book is that the author worked around the fringes of what many would consider taboo conduct, darts in for a moment or two of detail, but does not fully explore the issues he touches upon, nor does he complete his tale. Another author that I am a great admirer of is Penelope Fitzgerald who said she never let her characters decide where they would go in a story, she decided their every move. Now again this may sound obvious, who controls their characters if not the author, but she was speaking of having a plan for her players from opening page to closing paragraph. Mr. McEwan does not manage the detail of his characters here, he asks the reader to fill in the detail or in some cases the blanks. In this book I do not like the decision he made, but for admirers of his work that wish to go back to his earlier published material, this is a quick and interesting read of an author that has gone on to be internationally recognized.