That depend on which Iranians you speak. The Arabs you mention are nothing to me. To me the greatest Iranian leaders are Cyrus the great, Dariush the Great, Shapur, Surena, etc. And maybe Iran is islamized, but the Persian culture is stronger than ever in Iran. The biggest festivity in Iran (Norooz) is of Persian/Zoroastrianism origin. People give their children more often a Persian name and the Shahname is for the Iranians like what the Quran is for muslims. No Iranian calls himself a Arab and they know their culture/history is far superior to the barbaric history of the Arabs.
You are speaking for yourself from the Netherlands, Unless you want/intend to stir some trouble in Iran, you should watch your words, the name is The Islamic Republic Of Iran and the latest elections showed what the majority of Iranians think and want.
Persians have accepted Islam and the Arabs who brought it to them since its inception 1500 years ago.
So how big an Iranian are you!, Persia was great 3000 years ago, and what you need to understand is that many civilisations preceded it and came after it.
Mesopotamia, Assyria and others made Persia what you feel so proud of, and both were in Arab lands, today Iraq and Syria without talking about The Egyptian Arab civilisation of more than 15 000 years of history.