People are more pissed that Robb's wife was killed which didn't happen in the books. Also my wife didn't read the books so she got to have the reaction we did when we read about it.
Oh and I'm allowed to be annoyed by the Kill Bill special effects. It turns a poignant scene into a farce. Look at Braveheart which had the exact same wound on Wallace's wife, and then on the noble. No fan-squirt of blood but a faint blood squirt. Lots of gurgling and blood. It's visceral, real, and adds to the drama. Then again I'm expecting too much of a show that coined the phrase sexposition (exposition in a sex scene.)