It's amazing how well this game translates from the real life counterpart after a while (depending on how you play).
I have scored heaps of tries from simple draw and pass. This is a really good option if you can draw two or three players in and you're attacking near the line. Once you get that pass away, just draw and pass your way to a four pointer.
Also occasionally you'll be running it up diagonally and notice there's at least three or four defenders swarming across towards you. In this situation I run straight back at them and pass across just before they hit me - really opens them up.
Second-phase play is king. If your player is standing in the tackle, a lot of the time someone is waiting for an offload and he has space to run to. Go for it.
When you hold down the pass button and it throws a long cutout pass, doing this then hitting the line will often win you an offside penalty as players out wide sometimes don't make it back the ten.
If you have a penalty 10m out from the opposition's line, take the tap (unless two points is a much smarter option). When you do, sprint at the line and just as you're about to get hit throw a dummy and hammer that try score button. So often the key defender will fall for the dummy and you'll dive under them for a sneaky four pointer.
Cheeky tricks.... one is to aim your kickoff at one of the blokes who stand on the ten metre line. Do the double tap and (only occasionally) they'll catch it before it makes the 10. Don't bet on this working all the time though.