UCL is far more competitive than World Cup. Spain won the World Cup by scoring only one goal in each of the games in KO. Holland reached the final despite having a defense which would have made current's United defense look grand. Their CB were Heitinga and Mathijsen.Spain managed to win everything those same years and are essentially Barca minus Messi.
Have you forgotten the all time CL scoring record he broke last season? Messi's 2nd goal against us in 2009 wasn't that "vital". Ronaldo's goal against Chelsea however, was definitely vital.
There were a few teams on Europe who would have stopped that Spain team. FFS, Croatia almost managed to stop them. Portugal who were pretty shit send them to penalties.