I had never heard of Redwall nor seen it, so I gave it a go and had fun watching it.
It had a special atmosphere to it with its medieval setting filled with incidental music reminiscent of folk music from the English middle ages which helped it in creating its own identity. The little details in how many of the characters have biblical names, at least in the first season, was a clever touch since it all revolves around this abbey called Redwal.
The seasons are each based on novels in the Redwall series by Brian Jacques, and while it stays true to the source material, not all three seasons are equally strong. But that aside, it keeps a mature tone and may scare younger children, but has no graphic violence to it. The second season, Mattimeo, has the most weight to it in my opinion, because of the magnificent contribution by Tim Curry as the dispicable main villain Slagar. That season kept me in the front of my seat because of him and the interplay between the heroes and the villains in a story of courage, survival and trust. But I must adress one thing that bucked me a little: the order of the seasons seems a little odd, and you'll discover when you get to season three.
The animation was really good with its detailed backgrounds and warm colour palette even though it was inconsistent with the character designs, because their shading often disappeared making them look flat. That's the only thing on the animation.
Recomendable to all who likes the medieval setting with sword fights and all that stuff.