While conducive to verisimilitude, it's not a good thing if you want your combat system to be snappy and responsive. They might be able to make it work, but if they can't, I'd prefer them to forgo excessive animation in favor the combat system being fun. Otherwise, they might be changing their combat system to be based around commitment to animation, like the souls games, but that's gonna slow the game down a lot. Not saying that's necessarily a bad thing, it's just going to be way slower than the previous games if so.
On the other hand, if Kratos' other weapons don't have their own QTE animations, I'm gonna be pissed. The brutal kills are the main draw of the series' combat loop and it's somethign that they should have worked out back in GoW2. If not then, then surely GoW3. But Whenever the enemy got an O above their heads and you went for it, Kratos snapped to the Blades regardless of what you were wielding at the time. They need to change that.