Masoud, I will throw few things out there
1) ISIS will be bad for Iran for sure. We all hate it.
2) Israel is a big one and important as ties down US hand to deal with other issues. It weakens US in front of the world as they watch genocide and see US support it in the UN by vetoing any action and supply weapons and money to Israel. It weakens the UN as Israel undermines it at every turn. Especially, when Israel hits UN schools, markets, snipers civilians, etc.
3) As for ISIS, now sure who created it and benefits beside Qatar and Saudis. but one thing is clear, ISIS are taking over all the tribes, and different terrorist groups and becoming one big entity with alot of money. Once their leaders are rich and fat, they like to keep it that way and they will not go on terrorist attacks anymore and worry about the neighbors such as Iran. Perhaps, it is good for the western world and bad for Iran. Dont know. It is crazy and not much news coming out of it.
Israel conflict is paramount to the world as again it weakens UN and US. Other dictators watching it think they can get away with it too.
The foundation of a planned Sunni Khalif is being laid right in front of our eyes......and we are all looking somehwre else!! How many people including Christians have been killed by ISIS so far? How many have fled their countries? yet, one of you even mentioned things are going well for Iran!! Let me assure you - nothing is worst for Iran, and the rest of trhe world, than a Wahabi takeover of anywhere in the ME.