While the concept (Quantum Leap with domestic and social consequence) and the cast are superb, the writing leaves much to be desired.
Early episodes presented surprising twist endings but they were quickly scrapped for easy-to-follow neatly wrapped melodrama. While the dramatic conflicts are resolved far too quickly the sci-fi aspects take the back burner leaving the built-in geek audience for the show with nothing to obsess over.
Ultimately, I choose to give the show the benefit of the doubt and believe that the answers are/were coming. While not my favorite show by a long stretch it kept me happy while waiting for the next Lost or Heroes. I'd welcome the show's return, but should it not may it rest in peace.