I saw it at the Young Vic in April, and theatrically it worked wonderfully.
Bear in mind the plot is no more intrinsically shocking than the children's puppet show than I saw on the beach of my home town when I was seven or eight.
The ending is a celebration of the union of man and woman, (although the man has murdered his first wife and baby first) and no-one has ever suggested that this work is undercutting that happy ending.
It is a funny work, but I am so glad I saw it at the Young Vic with the excellent Andrew Shore mugging it up for all he was worth.
Here is a review by a regular board member:
http://www.operatoday.com/content/2008/05/eno_has_one_par.phpI was there that evening with Ruth, and I can agree with her, although she has picked up lots of things that passed me by.