Barcelona was brilliant in that first leg against Arsenal despite the loss and Barcelona was far, far, far superior to Arsenal in the second leg if you watch the full game.
Too many people pay attention to the result only. The whole Arsenal tie was close in terms of scoreline, but as far as the football that was played in the 180 mins., it was a very dominating display by Barca.
The 2011 side didn't have the best stats. But if you look at the games back then, almost all teams we played against were too scared to attack us. That's the most satisfying thing for a fan to experience. For me at least. This has the effect of reducing all stats, for both teams.
For the 2014-15, yea MSN were scary, but overall the team was a normal great team, which as Wolfe said, was top heavy, with a not so great midfield, and aging defense. The midfield was very good, make no mistake, but absolutely pales in comparison with 2009, and it's not even comparable with 2011, when all of Xavi, Iniesta, Busquets and Messi were playing at their peak.
2014-15 Barca is similar to 2016-17 Madrid, except with a slightly weaker midfield, but with clearly better attack. I think out of 10 games between these teams we'd win 6 and lose probably 4.
The 2011 team is a different beast, because they will force themselves on every other team there is. So, automatically, you can beat them, but you need a lot of luck, and hope that the finishing of the Barca players would be off on the night. Over 10 games, there's a lot of hoping
from the opponent.
So, we need to define what we're judging and estimating here. Over 1 game, all great CL winners, like Bayern 12-13, Liverpool of last season, Madrid of 2016-17 and 2013-14, maybe even Inter 2009-10. All of these could have a more than fair shot to beat 2010-11 Barcelona. But over a decent sample size, let's say best of 7 games, something like a NBA playoffs model, 2011 Barca beats all of them convincingly. Not one of them would make it to game 7.