Game Revolution has written up a review of The Elder Scrolls IV: Shivering Isles, giving the expansion pack a somewhat mediocre score of "C+" due to the bugs it shipped with:
The Shivering Isles is a little bit too right in the head. We expected to have our sanity challenged by talking dogs and barking women, not game breaking, data corrupting bugs. Still, those of you without corrupted save files might consider a trip to the land of madness it is a strange and bemusing place, and at least it's more Oblivion. I just can't figure out what the developers were thinking when they let ship a broken game. Were they insane?