The Koala Brothers series is fun, original, and a great choice for families. The characters are nice "people" (okay, echidnas, koalas, tortoises, etc.!), but not perfect. They learn important lessons in each episode.
The claymation in this series is adorable. The animal characters are interesting and endearing. This is a series with good values, yet it doesn't take a preachy approach. Instead, it just illustrates some dilemmas which kids can face, and shows the characters learning from experience how to handle these situations. It also is really based around the idea that in life we should "always try to help!"-- what a great message to reinforce.
Best of all (?!), unlike many programs for kids the Koala Brothers series is NOT torture for adults to watch this series with kids-- you'll find it entertaining, too.