For me, FC Porto was the most impressive team of 2011.
It gets old complimenting the beauty of FC Barcelona's style and the fluidity and power in their gameplay.
Yes, they're the best right now, and probably the best in history as well. I personally cannot wait to see them be dethroned (though I understand I am probably in for quite a wait).
But my point is, whereas FC Barcelona's dominance was expected and anticipated by many, few people expected FC Porto to show the kind of dominance over Portugal and the Europa League that they did in 2011.
The FC Porto of 2009-10 had finished third in the Primeira Liga, which is about as low as Porto ever goes in its domestic league. It had missed out on Champions League qualification to Sporting de Braga, and won none of the four competitions in participated in in 2009-10.
Fast-forward one season, and Andre Villas-Boas had changed all that. Domestically, FC Porto posted the insane record of 27 wins and three draws. They won the Millennium Cup with ease as well, tearing apart Vitória de Guimarães 6-2 in the final.
And to prove that it wasn't a fluke, Porto went about annihilating teams in the Europa League as well.
After going undefeated in their group, Porto blew away the likes of CSKA Moscow, Sevilla, Villarreal and Spartak Moscow to win the Europa League title against Braga—the team that kept Porto out of the Champions League in 2010.
Hulk and Falcao finished the 2010-11 season with goal totals of 35 and 39 respectively.
But sadly, it could not last. Andre Villas-Boas left for greener pastures (and more money surely) against the advice of FC Porto president Jorge Pinto da Costa, while Radamel Falcao was also sold to Atletico Madrid for €40 million.
The future still looks bright for FC Porto, as the squad raised a financial windfall from Falcao's transfer fee and massively successful season.
Undoubtedly however, FC Porto will not see a season as successful as the 2010-11 season was for a very, very long time.