Take me for crazy, but I believe the kits we play with can also psychologically influence the players. As far as I can remember, we haven't delivered top notch performances with our orange kits in the 2012/2013-2013/2014 seasons.
I really like the new blue kit , I hope we'll play with it more often and get accustomed to it.
On pure footbalistic terms, I think Rakitic, Messi and , to a lesser extent, Suarez made some mistakes with their movements. I often noticed that when Messi went on the centre of the pitch, we had to suffer from Roma's counter-attacks on our right corridor. Suarez should occupy more the right wing when Messi goes at the centre of the pitch.
Rakitic needs to understand he still hasn't got the technical skills of a Xavi or Iniesta. I would like to see the Rakitic of last season : vertical runs, shifting to the right side in order to create space for Messi ( who wasn't there yesterday unfortunately), defensive coverage, physicality etc...
Rakitic and Messi seemed to be tired to be honest. As solid as Roberto is, he cannot bring what Alves brings offensively. With Rakitic not having it and Messi doing some unnecessary moves to the middle, we had to pay the price for it I believe.
Iniesta, Busquets and Mathieu, on the contrary, were quite solid.