I haven't had any issue
s as such.
I received a Cinderella with a spine slash, but then I've also had spine slashes from Amazon, HMV and Play.
My V For Vendetta came with a dent on one corner, but then so did Brazil from Amazon.co.uk and the Spider-Man trilogy from Amazon.de.
Iron Man 3 was dispatched late, but I've had titles sent out a day or 2 after the release date from every retailer I've ever used.
Basically, it happens. However, as soon as Zavvi does one of the above, they receive a tremendous amount of vitrol that Amazon and Play never seem to. If you do speak out, you end up being 'a Zavvi defender'.
That said, their refund system is really poor and the fact you can't edit card details or addresses is something out of the dark ages.