It sure lives up to its reputation!
The sole thing I knew about 'Watership Down' pre-watch was that it's relatively graphic and had an impact on children at the time of its release. Well, I can certainly see why! Heck, even by today's standards it's still pretty out there in terms of how it portrays the violence.
The animation, for its time, is absolutely splendid - super effective! The music is also noteworthy. I will say that I don't think the characters are anything above solid, like post-watch I can't really remember any of them individually; visually at least, because the voice cast are very good.