I liked this movie. It was a bit different to the book, but I don't think I've read the book. However my daughter has, and we watched it together as she pointed out all the differences and gave bits away. It explores lots of issues, I particularly like the issue with Colin, everyone telling him he's sick therefore he acts sick and is sick. So tragic. It also portrays how much impact parenting has on children, yet despite this they can over-come them.
I love the magic, the innocence and of course the magnificent gardens. It's a classic, with many adaptions. I haven't seen/read any other to compare. I recommend it. Good movie to watch with your kids.
IMDB The Secret Garden