Earlier quoted context omitted.
Whether a state uses terrorist tactics is orthogonal to the issue of it being a state. Was the Russian shooting down of MH-17 not a terrorist act undertaken by a state? How about the bombing of the Beirut barracks? How about any number of acts by Nazi Germany, Communist Russia, or Imperial Japan?
Sure, I won't even dispute that. What I'm disputing is that the parent poster said that ISIS did not use terrorist tactics. That is blatantly a false statement. I can't believe the negative reaction towards pointing that out.
1) At points, they were waging a war that did not rely on terrorist/guerrilla tactics. OP did not claim they don't do 'terrorist stuff' at all. Waging conventional war requires control of territory, which is why this is important.
2) Saying ISIS is/controls a state would have you labeled as a terrorist sympathizer in the media or in conversation. This demonstrates that calling something a 'state' has an implicit moral connotation in popular culture. OP is arguing this should not be true.
None of OPs points were a _moral_ judgement of ISIS. I think we can all agree ISIS is bad.
For instance, I strongly believe Palestine should be an independent, free state distinct from Israel. However, the UN _recognizing_ it as a state does not mean it magically becomes one. The UN is just making a political point, but sadly one that has little impact on the reality in Palestine.