Problem is all that stuff you just said completely undoes the growth she had in Winter Soldier.
after Winter Soldier for all intents and purposes she shouldnt be in 'that' area anymore nor lost. Which is why fans are back lashing so hard because they felt it was a major step back in the growth she'd made in the previous films to make her the 'vulnerable one' and I can see their point. It at times is as if winter soldier black widow and AOU black widow are two different characters. So I can see why there's been such backlash.
Anyone that is expecting steady character growth, strong plot, or even traditional literary techniques/devices within a Hollywood film of superheros is kidding themselves. These films are made because the average consumer knows who the heros are, and they also like the fighting and seeing [expletive] blow up. I have said I am not happy with the way AOU played out story wise and also the other parts I didn't like, but that should be expected from these sort of films. You don't watch a superhero movie based loosely off of comics for strong story mechanics, you watch it for the action.
If this was suppose to be an award winning film in terms of story telling, character development, and strong plot I would understand those gripes. However, anyone that enters a movie theater expecting to watch a superhero film should know those things won't be in the movie. If they are they make the film that much better, but their absence should be surprising to no one.