The Pumas took advantage of their forward superiority to produce a powerhouse performance in the tight, to secure a 23-19 win.
The match-winning try came in the 71st minute when, with Simon Taylor in the sin bin, the Pumas' overwhelming forward power forced Scotland into collapsing a scrum and referee Kelvin Deaker into awarding a penalty try.
While that moment encapsulated Argentina's superiority up front, it was the Pumas use of the rolling maul that upset former Glasgow favourite Sean.
"It is frustrating, but it really is hard to stop the driving maul," he said to Sporting Life.
"The rules need to be changed, because the referees give a lot of time for teams to set up and get going again.
"It's good if it works but it's damn boring to watch from the stands, but it's part of the game so what can you do?"
Taylor's 65th-minute sin-binning for playing the ball on the floor, proved to be the pivotal moment of the game.
With Scotland leading 19-16 when the influential number eight was sent to the bin, the Argentinian forwards recognised it was time to seize the moment.
And seize it they did, with an awesome display of power that left Scotland's seven-man pack with little choice but to commit infringement after infringement in order to prevent the score.
After the consecutive seventh penalty, this time for Scotland collapsing a scrum five metres from their own line, referee Deaker had little choice but to award a penalty try.
Sean felt it was the only time in the game when the Pumas were truly on top.
"We were on top of them for them for most of the game and the penalty try obviously put them back in it, which is a horrible way to lose a game," the 24-year-old Northampton flyer said.
"The scrums kept falling down but it's one of those things when the ref doesn't really know what's going on in there but you've just got to accept it.
"We really should have been well on top of them by that point, and we had chances to put them away which we failed to take."
Scotland take on Samoa next weekend followed by the small matter of the All Blacks the following week, when they will be hoping for bigger crowds than the desperately small number who turned out to support them on Saturday.
Less than 15,000 supporters saw Frank Hadden's first game in charge end in defeat.
But despite the disappointing crowd, and the disappointing result, Sean insists the spirit in the Scotland squad remains strong.
"The spirit is still OK, it's reasonably up there, it was just one of those games that slipped away.
"We're just going to have to look at what went wrong on Monday and Tuesday and try and put it right.
"We've got another two games to go so we've got to keep our chins up."