The Tony send off was more than she got, that's true - but when Natasha died they were still in mid-battle for survival and had to move on pdq. I did note the Barton family off in one very far corner during the Tony thing and thought at the time that they were probably mourning for someone else...

But as for the complaints - no, the ones I've seen have been just the visceral "women are killed just for man pain" responses. Which to me is right up there with "women shouldn't be allowed in combat because they might get killed."