Well that was before her buff, not that i expect it to change much (hopefully it doesn't).
I mean your assessment isn't wrong, but you are discounting one thing: she's a one hit kill for every character that isn't a tank from all ranges.
Like she's not ideal for every map and situation like she used to be, but for maps where she can get a clean sightline for most of the battlefield without being contested unless the enemy team go out of their way to shut her down, she's really good.
Example includes attack on hanamura and king's row. King's row especially because she can shut down over half of point a just from spawn.
But yeah, for consoles i dunno.
Well, like I said, I totally agree with you that that is her strength, if she gets the headshot, the fight ends there. But if she doesn't land that, she's worthless. She's a ridiculously all or nothing characters with almost no advantages except for that one single thing.
I feel a good way to illustrate her purpose in the game, and why it fails, is to compare her to bastion. Okay, Bastion has his turret mode, that also ends characters pretty instantly if they find themselves unlucky enough to be in his line of fire. To counter that, Bastion is extremely easily flanked and destroyed.
But the key differences are Bastion's field of view is pretty wide and he has a stream of bullets, meaning if someone gets into his line of fire, there's a fairly good chance that he'll win unless they act fast. Secondly, Bastion has other utilities. He can self heal, his default mode is gun is fairly useful, and his ultimate is a very powerful surprise attack that can turn the game around.
In comparison, Widowmaker's grapple is one of the least useful manuever abilities, her venom mine barely does any damage, and her ultimate is not only all that useful or reliable (you can't know when a sneak attack is going to happen before you activate it, so you can only activate it and hope the enemy isn't coming from the direction everyone expects it to) but Hanzo has a spammable ability version of it. And since she can only fire off one shot, an enemy being in her line of sight isn't a guaranteed kill, unlike bastion.
I mean, you can go "Console lulz" but this is just a flat out bad character because she's one note. It's a good note, being able to instantly murderize any nontank in one shot, but even PC players can't use it too well (I think I read a statistic that said the top Widow players only get 30% headshots somewhere), and my point is that she NEEDS more abilities that she can contribute to the game.