I've just finished watching it, it was ok but there wasn't much emotion in either the animation or the delivery of the dialogue- dialogue was often too fast and without much emphasis, even though there was something dramatic supposedly going on.
Overall I preferred the original film (book>film>miniseries in that order). I quite liked that at the end when the little ones ask for a story about Hazel-rah, the storyteller is reciting the start of the novel ("The primroses were over..." etc is IMO a very memorable opening to a novel). I can't recall whether the original film did that, it's been years since I saw it. What I do remember is how much more dramatic the performances were though - from Fiver keeling over and having seizures during which his terrifying visions appeared, or the menace of General Woundwort, or the sheer horror of the scene where the original warren is gassed, the black rabbit of Inlé visiting Hazel - all so much better in the film...
I thought the best thing about this mini-series was Peter Capaldi as Kehaar - that stood out as a great performance in an otherwise lacklustre production. Real shame as there are some very good actors in it.
(Just in case it is not apparent, I am a huge longtime fan of the novel, read it for the first time when it was newly published* and couldn't put it down, and find it unforgettable).
*(Edit - actually I have just looked at the publication date and realised that my claim to have read it when it was first published is most likely inaccurate - I did read from a young age and was advanced in my reading, but that is pushing it by a few years for a novel of that size and complexity

)