Yeah, I think that's where one of the problems lies - people are expecting this to be a KimchiDVD, Novamedia etc. quality lenticular, but realistically I definitely never expected it to be one - it's Zavvi's first ever attempt at a lenticular package, I doubt even the likes of KimchiDVD started out with amazing lenticulars for their first releases (though I could be wrong, as I've not looked in to it).
I very much have a love/hate relationship with Zavvi. Their customer service has always been pretty terrible for me, but when things go right they can sell some pretty nice steelbooks. I'm far from a Zavvi defender most of the time...
However I do think the main 'issue' with this release has been that some people have had vastly unrealistic expectations; and a lenticular not being what you had hoped it would be still doesn't make it faulty/defective.
Personally, I'll be waiting until I receive my copy before I judge the quality of the release - though from what I've seen in pictures it looks like the overall package might actually be better than I expected.