"House"... not the grumpy crumudgeon I used to love

What is it with "House"? When the show started, House was a grumpy, complicated curmudgeon, and the medical mysteries were intriguing. But now the irrascible old coot is just plain mean, not only self-destructive, but destructive to everyone around him. And the medical mysteries are rather lame, turning into an exercise in how to torture a patient before actually helping him. Are the writer's getting tired, or have they exhaustive the materials?