It not only lacks OUV, being of mere regional importance, but also suffers from lack of authenticity (e.g., due to poor reconstructions) and proper preservation due to construction of modern hotels
I can't remember having seen the "only of regional importance
" argument used by ICOMOS in recent times. In the earliest days of the WH scheme it was often adopted. Then there was perhaps a different "vision" as to what sort of sites would constitute "World Heritage" -all Taj Mahals and Grand Canyons, though that doesn't explain how e.g The Madara rider got in (1979) - a "regional importance" site par excellence if there ever was one!!
The development of "case law" as more and more middling sites scraped in plus the growth of beliefs in the essential importance and equality of all cultures of the World seemed to make this rather damning put down somewhat passé.
ICOMOS would seem to have overstepped matters and should perhaps have limited their criticisms at the authenticity and too many modern buildings. It could I suppose have said that the building isn't unique enough or of good enough quality compared with others but "only of regional significance" is not a good enough reason IMO.
But I think we all know in our hearts that, despite the valiant efforts each year to conjure some meaning out of the phrase "OUV", it just isn't definable in any objective form and that, after a few hundred "top" WHS, the rest are on the List because of their medium interest, good nomination files, cultural bias in the assessment (not always operated solely in favour of the "west") and international politics! That doesn't mean they are of no value just that they aren't any more "special" than many other similar sites which are not on the List!
Maybe Solivagant, who saw almost all Iran WHS and many TWHS, can testify whether there is an intimate Safavid or Qajar palace among them
I don't know to what they might be referring - they really should have been more specific.
As I haven't seen Sheki Khan's Palace I only really have Els's photo to indicate what it looks like - but I don't know how big/magnificent/intimate it is etc. The already inscribed Eram Gardens in Shiraz include a "small" Qajar Summer Palace which has similar stylistic features (we visited the Gardens but the Palace is closed). See www.google.co.uk/search?q=eram+gardens+photos&tbm=isch&tbo=u&source=univ&sa=X&ved=0ah UKEwjwgcjVv4DUAhUJBcAKHVAvDR8QsAQIJg&biw=1600&bih=770
Regarding Safavid examples I found this comment on the Web "SAFAVID PALACES - Isfahan, under the Safavid dynasty witnessed a golden era of construction and development. Extensive construction was carried out in Isfahan. Magnificent palaces and beautiful gardens and orchards were built along the Zayandeh Roud River. Unfortunately, after the fall of Safavid Empire and especially during Qajar period most of these palaces were destroyed."
So Ali Qapu is the only Safavid Palace in Isfahan and is inscribed as part of the Meidan of course. But I also found this when searching on Ali Qapu"Ali Qapu (also spelled Āli Qapu or Aali Qapu) usually refers to the name for the palaces of Safavid kings. When Iranians were defeated by Ottoman forces, they were forced to move their capital from Tabriz to Qazvin, and then to Isfahan, to avoid occupation of the capital city. At each of these cities, they established a new palace. It may refer to: East-Azerbaijan State Palace, Tabriz, Iran, known as Aali Qapu during Safavid times..."
We visited Qazvin but very little is left of its Palace. see - https://www.youtube.com/watch?v=G_1teEUvvxQ
In Tabriz too the Safavid Palace has been destroyed/rebuilt - https://en.wikipedia.org/wiki/East_Azerbaijan_Governance_Palace