1st season GREAT 5stars. Second season, ok 4 stars. Third season a 'remake' of first season and I stopped watching 2 stars. Also series-itis in that they would not kill off great actors even if the plot required it. The creators didn't think about 'what happens after season 1', a not uncommon problem (Joan of Arcadia, Northern Exposure
When it's good, it's exceptionally good. Great cast of characters and intriguing plotline. Cons: Sometimes dips in quality, writing can get poor. It can often lose sight of the big picture several episodes at a time.