I think many are way too harsh on Ole. Watching how we set up against Barca was interesting and also sign of things to come (off the ball) hopefully. I mean there were many instances where we didn't let them cross their half. Pressed very well, especially when they had goal kick, didn't let them to pass the ball in defense so they went long ball route with Smalling, Fred, McT winning them with ease and many a times won the ball in their defensive third.
Obviously we can't sustain it because of poor fitness levels but going by Ole's words in previous interviews, I'm guessing we will see lot of this next season.
We did well in build up play, got into promising positions and then missed the final ball (mostly thanks to Young). Either we should play Dalot as RB or sign a new RB.
Edit: Also never saw Messi being so ineffective in the game. He was key for their goal but apart from that we handled him very well and this is without parking the bus and actually working with a proper plan. I was happy with the way we pressed after their first goal.