Was away from home last night watching the match so haven't read any of the threads about the game.
My 2 cents would be that Barca deserve there place in the next round. Fair play to Arsenal for sticking to there plan at the Emirates and they went into last nights game with the right attitude i believe, but as we seen barca for most of the 1st half had about 65% possession, there is very little you can do against that. For the goal Iniesta was up to his usual tricks, great feet and then the most perfected of chipped passes to Messi, at first viewing i thought he messed up his first shot but the angle behind the goal clearly shows he meant to scoop the ball over Almunia, unbelievable stuff from him as usual.
Busquets was poor for the og, i think he might not have even seen the ball as he was behind 2 Barca players iirc so was slightly unlucky, but he didn't look convincing at all going for the ball.
Van Persie's red car was a disgrace, no doubt about it, the referee should not be aloud ref in the CL again. On Sky they said the time between the whistle and RVP kicking the ball was 1 second,
1 SECOND! a player should always play the whistle and keep going until he is sure, i believe it would not have been easy for him to hear the whistle in front of 98000 screaming fans... Plus for all RVP knew the whictle could have come from Pinto

Arsenals plans were ruined from then on, they managed to take the ball off Barca a few times and they would get to the half-way line, look up, nobody up there, give the ball back to Barca and defend again, they were never going to last 30 minutes doing that against Barca.
The other 2 goals for Barca were pretty routine and Messi and Villa could easily on another day have scored hat-tricks, Almunia did brilliantly to keep the score so low. And even after all that if Bendtner wasn't so useless he could and should have won it for Arsenal at the end.
Overall Barca did deserve it, i love Arsenal and how they play but i am delighted to see Barca through. Imo the only of the 2 teams really capable of winning the CL was Barca dn thats why i was hoping they would win.
Best of luck to Arsenal in the PL and i hope that this will serve as a blessing in disguise to give them a clearer run in to beat United to the PL Title.