Do some of you guys show up to crime scenes in progress and heckle the lone beat cop on the scene, asking "lol, where are the rest of the cops? This is totally unrealistic!" You can't expect Tony Stark to go from lounging on a sofa in New York without any suits to all up in the DC Helicarrier's grill, or London, in the fifteen minutes that the threats are known and active. It is much more reasonable to assume that he didn't even know what was happening until the threat was over, rather than having him show up immediately to the scene suited up and ready to go. Remember, all of the climactic action in this movie took place during the time it took the Helicarriers to reach altitude. And no news report would have any idea that they were "bad" Helicarriers, and wouldn't have known until they started firing all over the Eastern Seaboard. The first moment that Tony Stark would know something was wrong, if he happened to be watching the news at the time, would be when the carriers started firing on someone who was flying around them. And even then, he would assume that the guy flying around was the threat, and that SHIELD could handle it.
It's an even worse complaint with Thor 2. How unrealistic would it be for any Avenger at all to show up halfway around the world in the fifteen minutes that the elves were active? Shit, it would be unrealistic for local news crews to make it to the scene in that amount of time. It would have made for a funny extra scene, having Stark and Banner show up ready for action while cleaning crews were sorting the debris, but that's it.
Find a better complaint.