Playing Barcelona with 11 men is already a daunting task. Playing Barcelona with 10 men is an absolutely impossible task.
I believe Wenger's tactics last night were to defend in the first half, and change tactics in the second half, inject some pace and guile, and attack. Massimo's red card on Van Persie trashed any hopes of getting into the Barcelona box.
Heck, Arsenal needed only 1 goal to win the tie. Especially after being drawn against Barcelona two seasons in a row. I am sure Pep would be a quite apprehensive if Barcelona were drawn against Arsenal next season.
Heads high Arsenal and fans. Well played.
Set out to correct the world's wrongs and you will most certainly wind up adding to them.