Well, for one here you need to consider what material it is that you're shooting at. Bricks from your PhysX video react differently than wood in the BF BC video when being shot at. When you shoot grenades at wood, it blows apart like it's supposed to.
But I get where you're trying to go. Honestly, I think that BF BC damage looks more realistic, and in the end that's what matters to me because we're talking about making a game more immersive. When you shoot at bricks with a grenade launcher, they blow apart violently. They don't topple over like a deck of cards like in the PhysX video. Perhaps a few of them may after impact, but not as drastic as the PhysX video makes it out to be. And if you look at the PhysX video, almost every time the guy shoots the bricks fly in the same direction, so I really don't get what's so special about it.