It's hard to say based on the competitiveness of each season. 2010 Villanova First XV was a special team that have many reasons as to why they should be remembered for what they did. They managed to defeat a fancied Ashgrove side at Ashgrove which was seen to be pretty hard to do in those days due to Ashgrove's prior dominance and Mcmahon oval's daunting and intimidating atmosphere. I'm not sure if this is the case these days with teams beating Ashgrove at McMahon oval yearly. Villa managed to defeat sides were they were challenged to the final play such as Eddies, Marist and Lauries. They had very skillful individuals, however as a whole team they were the real deal.
2011 was in my books the most competitive season the AIC has seen for a while. You obviously had the likes of Padua, Eddies and Ashgrove sharing the premiership which says alot. In my opinion, the Padua and Eddies 2011 first XV teams were very well drilled, skillful and had very large forward packs with very creative backs. There was more desire for these teams to win a premiership as they previously had been bottom 4 placed teams. Ashgrove 2011 was a team with a few standouts such as their scrum half Scott Malolua but I don't think they overall had a better team than Padua and Eddies. This is very debatable however I must say that they still managed to have a share of the premiership which argues that they were just as good.
As for Iona this year, yes they won the premiership undefeated, had very skillful players, but was an easier competition for them compared to say 2011? Iona did manage to defeat Ashgrove at Ashgrove and beat the 2012 premiers in what was a very close game. It is very debatable and I must say that while Iona did win undefeated, I do think that the competition this year was not as competitive as years before. My reason for this is that the 2nd placed teams from this year only won 5 games each whereas in other years the 2nd placed team won 6. For example, last year Ashgrove came 2nd and won 6 games, 2011 was the year of the 3 way tied premiership and from 2002-2006 Lauries were always 2nd to Ashgrove winning 6 games most of the time. I know it's only one game but that does say something about a team being able to complete the season by winning the rest of their games with the disappointment of losing a premiership deciding match.
The other side of the argument is that Iona was just too good and dealt with very strong competition to win the premiership. I'd love to hear what people have to say about this years competition vs previous years. Finally, I congratulate Iona and I'm sure that they will be remembered for many years to come.