Three ways Barcelona could still improve

It might be difficult to imagine right now, but Barcelona could still make improvements to their seemingly invincible squad.  Today, they showed once again how much more class and talent they have than any other side at the moment.  They scored five goals against another one of their biggest rivals, Espanyol, and look as unbeatable as ever.  But if one were to nit-pick, these are three ways they could still improve:

1.  The center-back position.  Gerard Pique is good, but he is not tested very much because Barca possess the ball most of the match and when they do lose it, they usually win it right back before their opponents even get a chance to threaten the backline.  Carles Puyol has proven to be more of a threat on set pieces, and he is a beast in the back.  Imagine pairing him with Nemanja Vidic or Branislav Ivanovic in the back.  That would give them an aerial attack and make them less vulnerable when defending corner kicks.  When it comes to defending and attacking in the air, you can't get much better than Vidic and Ivanovic.

2.  Goalkeeper.  Victor Valdes can be shaky and indecisive in certain instances.  Imagine them with Edwin Van Der Sar, Iker Casillas, Pepe Reina, or Manuel Neuer.  Scary.

3.  The atmosphere at the Nou Camp.  Imagine if they had an English Premier League type atmosphere at home.  The Barca fans are way too reserved.  It's almost as if they are not satisfied unless they absolutely demolish every opponent.  There needs to be more singing and chanting during their home games.  The stands need to be as close to the action as possible.  Show some more enthusiasm for the absolutely magnificent shows your team has been putting on!

That said, there still isn't any team that can challenge this dream team right now anyway.