It's 3D animation, a few levels below the quality of Toy Story. I really enjoy the stories, the animation is great, the music is dramatic, but the real fun is the character development. Because it's a TV series, there is much more character development, especially of minor characters like individual clones and droids. Each show starts with a little lesson statement and then the show is about that statement.
I think it would be perfect for kids, but it isn't childish. In fact, there are some really cold blooded scenes. For example, in one episode a bunch of clones have had their ship destroyed and they are floating around in space in escape pods hoping to be rescued. The droids are sent out to "pop" the pods by cutting them open so there won't be any survivors. The droids engage in humorous chit chat and humming tunes while they kill the clones, as if they were picking up garbage. This surprised me as it seemed very harsh for a kid's cartoon. In my opinion, the TV show is much more adult than movie Episode 1, which had a lot of clown scenes with Jar Jar Binks. I highly recommend the Clone Wars.