Virtually every Iranian film i've seen- admittedly not a huge list- has been excellent, putting to shame most recent films in Britain and America!
I'd like to especially recommend;
The White Balloon (Panahi), Gabbeh (Mohsen Makhmalbaf) Close-Up, The Taste of Cherry (Kiarostami), The Day i Became a Woman (Meshkini), The Apple (Samira Makhmalbaf), The Colour of Paradise (Majidi)- but you can't really go far wrong seeing any that have been widely shown in Britain and America. I'd love to see more early classics like The Cow (Mehrjui), Still Life (Sales), Bashu the Little Stranger (Beiza'i). Also Nargess (Bani-Etemad).
It's interesting that Iran has produced some top female directors; Bani-Etemad, Meshkini and Samira Makhmalbaf. There's hardly a glut in Hollywood. Samira is the precocious daughter of Mohsen, and her step-mother/aunt is Marziyeh Meshkini. Quite a family!
Hamid Dabashi's book, "Close-Up; Iranian Cinema Past, Present and Future" is a useful introduction.