Tough question. Since the series are not so close to the book as the movie (which at some times also wasn't consistent with book), I treat each of them as separate works, with their own good and bad sides. That way I can like them both, while some fans of Watership Down like only the movie and they despise the series.
Pessimist sees a dark tunnel. Optimist sees a light in the tunnel. Realist sees the light of coming train. And a driver sees three idiots standing on the track.
"My heart has joined the thousand, for my friend stopped running today." - Watership Down by Richard Adams.