First of all, I want to say I am surprised to see 2 of the 3 previous comment stating that this series is targeting only young kids, since Legends of Chima is probably the first show my 4 years old son is watching that really caught my attention. I have seen a couple episodes of Ninjago and I felt like it was not as interesting as Legends of Chima, by far.
First of all, the universe of Legends of Chima is rather detailed, with a lot of characters, an interesting complexity in the relationships and interactions between them. The story line is also a strong point to me, I mean there is so much you can expect from a kid cartoon, but in this case, I feel like they put a real effort into it. I can't speak for the English Version since my son is watching the episodes in French, but the vocabulary is of a pretty decent level, and the french voices work for me. I actually watched the first and second season entirely with my son and truly enjoyed it.
Additionally, the franchise has been used to create a series of video games that appear to be pretty interesting to me, especially Legends of Chima Online, which is a Free To Play MMORPG, very successfully using the Unity3D engine, which requires no installation and which is a very very decent game to me, even for hardcore gamer I am (or used to be). We enjoy playing together and venturing in the world of Chima with my young boy, which adds even more fun to the show when we watch it.
In conclusion, I would recommend Lego Legends of Chima for younger and even older kids, and even though I am not a Fan of the Lego universe, at first glance. The 8/10 might appear a touch high, but it is certainly closer to the reality than the 1/10 it has been given in the other comments.
