Why is Barcelona so good?

No one can say that Barcelonas playstyle is not amazing. Even their opponents are mesmerized on how they move the ball and get their opportunities.

But how can they be that good, how can they outplay almost every team on the planet?
One thing is that they have one of the worlds most creative attackers, Lionel Messi, dribbling and make other players drool over his moves.
Let's see if they aren't going to win Champions League once again this year!
Go FC Barcelona!