Desire is what's lacking.
These players don't work hard enough off the ball.
Magic, I think it's partly that, but also that they are taught not to.
As MT says, they corral instead of tackle.
How often do you see a rfc opponent, with the ball on the HFF, take all day to decide exactly where he is going to place the ball, because the rfc player is standing 5 metres away with his arms stretched in the air waving them like an air traffic controller, instead of actually going up to try and affect the possession.
For all those that say that rushing at your opponent makes it easier for them to evade or 'baulk' you, I refer back to MT's post about looking at their hips. Secondly, a team mate could actually come from behind the play and HELP HIS TEAMMATE.