Well, it doesn't strike me as nice
and fulfilling (unless you're talking about the sense of fulfillment one gets by chopping off a hand or something), but depressing, yes, in the later chapters. Voice was a great read for me, due to the massive psychological factors involved in that one (anger, curiosity, depression etc).
GOTH (the 1st story) was made out of blood, gore and tonnes of Yoru-moe.
WRISTCUT was full of Shinohara-insanity, long and complex philosophical sentences, and more Yoru-moe in the end.
DOG was full of, erm, dogs? And a little twist in the end in addition to more Yoru-moe (a slight detail that enhances her moeness IMO)
TWINS was full of Yoru-moe, Yoru-moe, and more Yoru-moe. 'Nuff said
GRAVE is full of unknown stuff since I haven't read it yet
VOICE had lots and lots of human psychology going around, and a lot of intrigue (aka confusion if not read carefully). It also contains references to the earlier chapters and features some Yoru-moeness in the end.
I think you can guess which part of GOTH I'm really satisfied about...