I checked out the audiobook from the library because you really need this read to you by a British guy. IT'S 18 HOURS! And I did feel it at times. 

I think it's fine for the nostalgia value. I have fond feelings about it even though as a story about hyper masculine rabbits fighting all the time, it shouldn't be good. The decision that they needed does and decided to go take them was a little cringeworthy now too. But I can't help liking the idea of breaking away and creating their own nation where they can improve on the other warrens' flaws - be it danger at home, Cowslip's odd warren, or the authoritarian one - and be free to live how they want. 

It's both recounting WWII battles, as the author commanded troops in the war, and has things everyone can relate to - friendship, independent thought, moving away/exploring, home, finding your place. 

It's always ambitious to have underlying folklore, religions, and languages, though the Lord Frith and El-ahrairah got a little tiresome. But I like the way that these tales compared with the tales told at the very end show history being made.

So there are lots of problems, maybe it doesn't hold up, but I still can't help liking some of the characters and smaller storylines. A bit of nostalgia.