The format of "The System" has provoked much debate among Gaelic football analysts. Former Derry footballer and RTÉ analyst Joe Brolly, after watching Donegal overpower his county's team in the 2012 Ulster Senior Football Championship, wrote a column prophesying an All-Ireland win for Donegal due to the team being, he concluded, "virtually unbeatable". He was proven correct when Donegal retained the Ulster Senior Football Championship they had won the previous year before going on to win the Sam Maguire Cupfor the first time in twenty years. Brolly proposed at the time that Donegal were capable of swallowing entire teams into a vacuum. Keith Duggan—writing in The Irish Times after the 2012 All-Ireland Senior Football Championship Final—contested this notion, instead proposing that teams encountering Donegal had fallen apart due to their own weaknesses and that Donegal had merely exploited this. However, Duggan acknowledged that Donegal had "expanded the possibilities" of Gaelic football. Under "The System", players whose careers were thought to be behind them have been revived. Players such as Ryan Bradley and Anthony Thompson emerged as if from nowhere. The top teams in Gaelic football—Tyrone, Kerry and Cork, who had dominated the sport over the previous decade—have been made to appear merely ordinary, and have been swatted aside with relative ease. Traditional Gaelic football formations are rendered redundant under The System. A corner-back such as Frank McGlynn—who had never scored a point in his Championship career before scoring 1–4 in 2012—has been turned into ruthless attacking players, while corner-forwards—the traditional scorers—contribute to the team's overall defensive efforts.
Notable successes
The System was successfully used by Donegal to win the 2011 Ulster Senior Football Championship, the 2012 Ulster Senior Football Championship and the 2012 All-Ireland Senior Football Championship. Donegal's comprehensive defeat of Kerry in their 2012 All-Ireland Senior Football Championship quarter-final meeting was described by the national media as "the most seismic result in since the 1987 Munster final replay defeat to Cork". Ahead of the 2012 All-Ireland Senior Football Championship semi-final against Cork, nobody outside the county gave Donegal a chance, and Cork went into the game as heavy favourites to win the title itself—even though this was only the semi-final. Donegal deployed The System to devour the heavily fancied Cork team and progressed to their first title decider since 1992. Tyrone's three-time All-Ireland winning manager Mickey Harte, attempting to analyse the game for the BBC, expressed his shock: "To be honest, I could not see that coming. Donegal annihilated Cork, there is no other word for it." Donegal then unleashed The System on Mayo in the 2012 All-Ireland Senior Football Championship Final, rendering them motionless with two early goals and keeping them scoreless for the first sixteen minutes of the match. The first goal occurred in the third minute of the game when Donegal captain Michael Murphy lashed the ball into the net, having collected a high ball delivered by Karl Lacey. Championship Matters named it "Goal of the Championship". In the eleventh minute Patrick McBrearty's attempt at scoring a point came crashing off the Mayo post. Mayo's Kevin Keane fumbled, dropping the ball into the path of Colm McFadden who promptly slotted it into the back of the net for a second Donegal goal. McFadden, who scored a total of 1–03 for Donegal in the first half alone, was soon through on goal again only for Mayo goalkeeper David Clarke to block the strike. The System returned in full force in the 2014 Championship, with Donegal defeating Dublin in the semi-final to produce one of the most shocking results in Championship history. After the game The System was cited by the media as having been behind the outcome.
Views of opponents
Cork's Donncha O'Connor said of Donegal in 2012, "Every fella knows what the next fella's going to do. It's probably a bit dangerous if you're concentrating on what Donegal do, but it's just that they have a system. Whether they're up or down, they stick to it." His teammate Ciarán Sheehan said in 2014, "I played against Donegal in the All-Ireland semi final a few years back, their power and fitness was something else and unfortunately we couldn't match them. I think they're definitely back to those levels and with that power and physicality you can never underestimate them and they're well worth their place in the final ."
Criticisms
famously branded Donegal's style of play "Shi'ite football". He also criticised Jim McGuinness during the early development of The System—"There are people who go to the Hague for war crimes – I tell you this, some of the coaches nowadays should be up for crimes against Gaelic football". Less than a year before McGuinness led his team to All-Ireland success, Vincent Hogan branded him "a leader of sheep" in a famous newspaper article.
