Their actions should have consequences, I agree, Jude. That does not change my opinion of them. Not everything is black and white.
I have yet to hear a reasonable solution other than what they're doing, by the way. I keep hearing "they should ask for help!"
Ask who? Who is equipped to deal with this? This is a no-win situation. And that's how it was written to be. Asking for help doesn't change that. Their only option is to protect their own universe/Earth at the moment, until they figure out a way to stop these incursions.
But that's what makes it an interesting story. And it's what I liked about MoS as well. I'm kind of bored of the formulaic hero/villain stories that you seem to be pining for, Jude. Taking heroes and putting them in situations where they may have to go against their principles for the greater good. It's interesting writing. And when it's brought up in the book itself that what they're doing is wrong, I don't really see the issue. All of your complaints have been brought up in the actual book, Jude. It's part of the story. Let the story grow.
My problem is that thus far, there are no consequences for their actions (or the consequences consist of a vague instant of uneasiness between characters before the next super-mega-event comes along to change everything up again). The Avengers were complete dicks in AvX yet they were not only the victors, but treated by readers as the heroes, when I think it was clear that wasn't the case at all. Here again, we see them being dicks, and readers defending them. Will they turn out to have been "right?" I think the only way this ends satisfactorily is they turn out to have been very, very wrong.
It's fiction, there is always a better way. If not, why bother reading it? You could just experience real life if all you want is for comics to be as realistic as possible. Nothing is more realistic than real life. Superhero comics have guys who can fly and shoot lasers out of their eyes. It stands to reason they can be extraordinary in character too.
I don't mind the occasional grim and gritty, tough-decision-making hero. But the place of a character like that is to be begrudgingly respected but also somewhat despised, like Wolverine used to be. Now Wolverine is the headmaster of a school, everyone's best friend, and the moral center of the Marvel Universe who can travel back in time, kill a founding Avenger, and everyone is just like "That's so Wolverine!"
What makes a character like that interesting is that they go against the grain and do things their way, regardless of the consequences, but there ARE consequences. When the Avengers, the top heroes in the world, are grim and gritty, Earth-killing heroes, then there's no redeeming quality to the story, IMO.
The current Marvel Avengers comic universe is like saying "What if Mark Millar wrote Watchmen and the whole point of the comic was that The Comedian was always right?"