Leinster coach Michael Cheika was impressed with his side's performance as they secured top spot in Heineken Cup Pool Two with a 12-3 win over Edinburgh at the weekend.
The Irish province did not manage a try but did not ultimately need one against their Magners League rivals and progressed to the last eight with Wasps crashing out after a 21-15 defeat at Castres.
"I don't think anyone is under any illusions. We definitely dominated," Cheika said.
"We had all the possession. We defended pretty well when they did have it but we couldn't deliver the knockout blow. Obviously our tactics changed when we knew what was happening in the (Wasps) game as well."
In spite of dominating for most of the game, Leinster lacked the clinical finishing that saw them score 10 tries in their opening three pool games - but with Wasps falling short in France, a try-scoring bonus point was not needed by the Irish side.
Cheika added: "We were in their territory for so long and we just couldn't manage to get over. Maybe we were a little too focused on getting over instead of playing what we organise ourselves to play when we get in those areas of the field.
"We had a plan, but it became very evident after a certain period that we weren't getting four tries, once the rain came down.
"We adjusted to a different approach but there is no approach in football that says don't score tries. We are frustrated we didn't score more but we're very happy we are in the quarter-final."
As head coach Stuart Lancaster polishes the axe he will soon wield over his World Cup training squad, Exeter Chiefs coach Rob Baxter has backed Jack Nowell, Henry Slade and Luke Cowan-Dickie to be given a stay of execution.
Italy Under-20s held off a late Samoa blitz to retain their place in the World Rugby U20 Championship on Saturday and head coach Alessandro Troncon believes the experience will have served as a valuable lesson for his young troops.