Summarize the following movie reviews:

1. Raises important issues about the mental handicapped and nontraditional families that deserve a much smarter examination.
2. Nelson's direction is easily one of the best of this year.
3. I Am Sam is the green eggs and ham rendition of the custody battle melodrama
4. Every device of the movie's art is designed to convince us Lucy must stay with Sam, but common sense makes it impossible to go the distance with the premise.
5. This one is a keeper. Anyone who's ever been a parent or a child will be reaching for the tissue.
6. When Rita enters the picture, the whole thing falls apart.
7. One of the least convincing, most manipulative films ever made about the everyday struggles of the developmentally disabled.
8. It shows us that intellect and love are indeed related -- inversely.
9. Shines with warmth and illumination.
10. It can't overcome a strong, cloying feel that comes from watching someone pretend to be mentally retarded.

Summary:
Not only does the manipulative I Am Sam oversimplify a complex issue, it drowns it in treacle.