Pumas will be no pushovers in last eight
Last Sunday, Argentina really put it up to New Zealand, and if they weren't up against the most capped Test side of all-time they would have won in Wembley.
Their performance showed again that they are a top class side.
The winners of Ireland's pool - who are likely to face the Pumas - will have a tough quarter-final.
For months it's been all eyes on the Millennium Stadium for Ireland and France - win and you avoid the All Blacks in the final eight.
But if Argentina can maintain that level throughout the competition, they could be back to the standard of the 2007 World Cup, when they finished third.
In Juan Martin Hernandez they have one of the best centres in the tournament: he ran the show against the All Blacks, and could have a big say in the latter stages.
So it will interesting to see how things unfold between Pool C and Pool D - I hope it will be Ireland against Argentina in the Millennium Stadium on October 18.
However, Joe Schmidt's side will need to produce their best, or it could be another swift exit from the competition for Ireland at the quarter-final stage.