Some may argue that everything Mozart wrote was inspired, but just not equally inspired; and this seems especially true of his quartets. His mature quartets are much stronger than his earlier ones, just as his later symphonies are much more developed than those he wrote earlier on. Nevertheless, those who want a complete set of the Mozart quartets might want to investigate the Talich's set on Calliope. It comes highly recommended by a number of critics (Gramophone, Penguin Guide, Classics Today etc) and was also awarded the Grand Prix du Disque and the Diapasson d'Or.
This set of later Mozart quartets (#14-23) by the Alban Berg Quartett is an outstanding way to go for those who want to focus on the most interesting works. Other reviewers have pointed out the ABQ's merits, however, to correct a minor error in another Amazon review, these Teldec recordings were not made in the 1990's but instead date from 1976-79. The sound is excellent - I found the Tallich Quartet's recordings, which date from 1984-1993, unnaturally subdued by comparison.
I own the both the ABQ and the Tallich sets and can say that had I bought this ABQ set first, I never would have purchased the complete Tallich set. As it turns out, I rarely listen to the early works and the compressed sound is a negative.
Those who are looking for the later Mozart quartets, of which there is no shortage of recordings, will be very satisfied with this set.