Natsu was tagged a bunch of time by Sting's other attacks like Holy Ray, and also by future Rogue's light blitz. He's been tagged by attacks much, much slower than lightspeed. Natsu knew where Sting was aiming his roar, and moved before it fired. He aim dodged. That's all. This is like saying Captain America or Batman can dodge bullets because they react to people aiming guns at them. Igneel was fighting Acnologia in a stationary position. Igneel made no attempts to "dodge Natsu" because he was busy fighting Acnologia. To pretend that this is equivalent of Natsu blitzing Igneel with an attack is ridiculous. Igneel was dodging roars from Acnologia.
Magic power is magic power. Hax is just a fan-made term for abilities that don't generally involve beating your opponent over the head with physical force. Face's magical power operates on a continental level, and would defeat every mage in Ishgal. When used to create explosions, each face can blow up an area roughly the size of a city. The dragons overcame this magic power. Mind you, even without considering all of this, the fact of the matter is Fairy Tail had no way of dealing with face without resorting to Fairy Heart. Their initially plan was to have Warren telepathically call for help from every mage in Ishgal, and even that was deemed impractical. Nobody could simply run around and destroy face.
Dorma Anim
slowly drains the magic power of a planet that didn't have very much to begin with. It doesn't drain power from the mages, as literally everyone was still able to fight with their magic. It was defeated by Natsu, Wendy, and Gajeel. If Dorma Anim tried to fight the GMG mages, it would get wrecked. Ultear cannot enter the same space between time that Acnologia controls. That rift between time was created from the Eclipse. Dimaria has access to her own time, and people like Ultear can intrude upon it. Wall's etherion is utterly featless. It's wanked with poor application physics and random assumptions. Nothing you just mentioned is remotely on the same scale as face. Face would defeat Dorma Anim, Dimaria, and Wall at the same time. It would wipe out their MP and they would be powerless.
You really think Irene is saying that Acnologia is breaking the rules because he's flying? Why would Acnologia fly all the way over in his dragon form, only to stop short and walk the rest of the distance? You know what? Even if what you say were true, the fact that Acnologia didn't even both to fly all the way to Gajeel's location already proves that he was in no hurry. If Acnologia was truly in a hurry, he wouldn't drop out of his dragon form and walk the rest of the way. He was in his human form when he left Jacob and August, and he was still in his human form when Irene found him. He knew where Gajeel was, but didn't bother flying over to his position as a dragon. Perfect example. of why Acnologia wasn't in a hurry any better than this. Now you show me a panel of Acnologia flying towards Irene in his dragon form after Universe One.