I think for most of us there are two primary ingredients to a good story - the premise, and the manner in which it is delivered. I don't think most men are drawn to the plot of Austen's Pride and Prejudice, but there are few men with any literary acumen who would deny that Austen's prose is exceptionally well-crafted. On the other hand, Joe Heller's Catch-22 became enormously famous not because of the quality of the prose, but rather the cleverness of the comic conceits. One writer comes to mind who did it all. Charles Dickens was, and remains one of the most beloved writers of all time. Not only were his stories captivating but his characters fairly came alive and engaged readers emotions vicariously. We loved his protagonists, and absolutely hated his villains. Dickens could also be critiqued positively with regard to the literary devices he employed such as metaphor, foreshadowing, symbolism and irony which he delivered in precisely the right doses and at precisely the right times.
With regard to literary criticism :
A good literary critic is hard to find. I agree with those who say that appreciation of a literature is subjective - ALL art is subjective. An honest critic must put personal tastes aside and judge a work objectively and strictly upon its merits. I don't know if I could do this. Once, long ago at a movie website I voiced my disgust with that year's winner of the Academy Awards for "best picture" and many agreed with me. I made the comment that the viewing public would make better judges and that perhaps the "best picture" should be chosen by the number of movie patrons who actually went to see it in theaters. I was brought up by the short hairs when someone reminded me that the movies which get the highest number of visitors are children's movies because parents take their kids more than one time. The same could be said for books. There are some outrageously high volume sales of novels out there which are, for the most part literary crap. Not to say that these books are not entertaining within their own circle of fans, but they are not even on the radar with respect to being Pulitzer, or Man-Booker worthy.
I must admit that, like jennybug87, I visit the Amazon site to read critiques by average Joes like myself. I figure the high number of postings by the general public is going to average out to give me a better handle on whether or not I will like a book than a professional literary critic. More often than not it works but then ... sometimes it doesn't.