"Why go there? Isn't it dangerous?" was pretty much all I heard in response to telling people I was off to Iran. Whilst the west today has a bit of a confrontational relationship with Iran, it is in fact quite safe and the people are some of the friendliest and most hospitable I've ever met!
In addition, the history of the region (it is ancient Persia after all) is quite amazing and with 2,500 year old cities such as Persepolis, and the beautiful garden city of Esfahan to see, its definitely worth visiting and I can highly recommend it.