Running at the opposition is the point of the game. Webb Ellis picked up the ball and ran at the opposition

As with union, attacking plays often come off the back of a quick play of the ball, be that from the tackle in league, or the ruck in union. The difference is that it happens more often in league because there are simply more opportunities for it to happen.
That's the basic essence of the game. Take something simple like a kick return by the full back. If you look at the video below of Ben Barba from last season, it's incredibly exciting stuff. That kind of flair is only really possible in league though because in union, if the attacker was tackled they would lose possession or give away a penalty through not having big forwards on hand to contest the breakdown. It disincentives the back three running back a kick return, hence why so often you have garryowen after garryowen back and forth.
[video=youtube;RffAff7gUBI]http://www.youtube.com/watch?v=RffAff7gUBI[/video]
Offloading in the tackle is something else you so seldom see in union. You only have to look at how damaging Sonny Bill was when he crossed codes. It doesn't happen often though because you seldom have support players running off the shoulder of the attacker.
It's the same with dummy runners. In league such things can happen because it doesn't matter so much if the dummy runner is then largely out of the play because they aren't required to contest the breakdown. That isn't the case in union, so back moves often see the ball crabbing across the field so that the breakdown can be contested by lots of players.
It's no surprise that New Zealand dominate union as they do because they're largely the only team that play the game properly. They rarely try and win through goal kicking, but instead through securing very quick ball and relying on an exceptional running game.
The All Blacks are just as good to watch imo as Australia are in League.