This is true, but Game of thrones has always joined "in your face" story telling with "in your face" violence, gore, sex, whatever the situation is. This was no different. In fact it would have been out of place if they went soft with a scene like this.
I have absolutely no problem with the serie's violence, wether graphic or not.
Several times they have shown scenes violent but not without purpose.
I just felt that this scene, after the 2 or 3 violent kills shown, went a bit on the other side of " good graphic violence " to become " graphic violenceto shock the audience ".
For me it took a lot of the impact of the events unfolding ( that I absolutely agree, HAD to have some graphic impact and violence ) just to get that "wow" effect they were trying to reach.
After having watched the ending a second time, i think they should have stopped at Robb's violent death, and ease up with Frey's wife and Cat's deaths on the graphic side. It felt too much, violence just for violence.
We already had a shocking graphic moment with Robb's potential child's stabbing, some powerful emotion with Robb and Cat's short exchange, and some despair with Cat and Arya.
For me, they ruined all that with that Horror-movie-like double throat cutting.