The movies mostly worked, but the finales didn't. Though I'll credit Thor 2 for their creative fight scene at the end.
It's about what's at stake, not just about people dying. Most Superhero movies aren't about the world being in jeopardy, they're about a hero having a journey. When you make huge threats and then hinge those movies on those threats, then those threats have to be credible.
And I felt absolutely nothing for the last act of Ultron. I liked the movie just fine, but there's no excitement when the threat is just so absurd.
Don't get me wrong, if you loved those movies and think the final acts are great, then awesome. I love it when people love comic book movies, especially Marvel movies. I was just expressing a hope I had. I doubt, if my ideas were implemented, it would ruin anything for you, so it's a win-win for you. If they keep doing what they have (not these writers) then you're good. If they raise it to my standards, we're both good.