Dr. Johnson´s opinion  of the Vicar was expressed to Fanny Burney: "It is very faulty; there is nothing of real life in it, and very little of nature. It is a mere fancilful perfomance." This veredict is surprisingly severe, but not altogether unjust. Th faults of The Vicar, like those of She Stoops to Conquer, are palpable, and yet for most people these works make still very pleasant reading. The charm is in part due to the imaginative glow that Goldsmith so effortlessle casts over the action of The Vicar, and to his flexible and easy style.
   Much praise has been given to his style, which is indeed attractive. It lacks the coldness of the aristocratic manner, and it escapes the tendency of his generation to follow Johnson into excessive heavuness of diction and balanced formality of sentence structure. The unfriendly review of his Enquiry in The Monthly Review shows that Goldsmith´s former colleagues were aware of his criteria of style, his avoidance of "the quaintness of antithesis, the prettiness of points, and the rodundity of studied periods"; and yet they professed to feel a "remarkable faultiness" in expression. Probably even for them Goldsmith was hardly bookish enough to be a "fine writer". It is precisely for his lack of formality and for his graceful and sensitive ease, fluency, and vividness that we value his style.

References:
Routledge & Kegan P. (1967). A Literary History of England, U.K.: Edited by Albert C. Baugh 2nd edition