Pique doesn't really have much pace. Younger/injury free Puyol and Abidal did, so the 2/3 would compliment each other really well. Now you have someone who is usually technically sound (Pique) yet fairly slow along side quick defenders (Alba, Alves, Adriano) yet they aren't very gifted defensively. If Barca were able to make a move on Thiago Silva last summer, they would have brushed every team aside. He was out of this world across both legs this tie, coupled with the fact that he is tall/strong and very fast, he would have been perfect as a Puyol replacement for the next 3-4+ years.
Alves in general had a horrible game with his lackluster skyward cross/shots. Busquets probably had his worst defensive-mid showing in a Barca shirt so far in his career. Valdes was pretty much godly and almost stopped the goal with a toe tip. UEFA's site voted for Iniesta as player of the match and while overall he was probably the best offensive player, I would still give it to Valdes since he saved Barca countless times tonight.
Going to be an interesting draw on Friday considering all 4 "superpowers" went through. Personally, I am hoping that Barca get either Bayern or Dortmund. Would be interesting to see how well this amazing Bayern team would do against a possession based team. I believe they are overall 2nd in possession when it comes to league/UCL games and haven't really played anyone who is superior to them in holding the ball. I think this is the most stacked semi in a UCL in a pretty long time.