In the final third obviously you need brains and intelligent movement off the ball. However there are times watching Barcelona that it's just boring, when they're passing it around for 10 minutes between the back four and the scummy Anchorman, sometimes its very needless. Best style of football is attacking, ball retention with hints of agression and battle. I.e Bayern Munich.
Regardless of whether you love ball kissing or hoofing. Hopefuly Deulofeu stays for another year, regular game time will only be a good thing and there are in my opinion, tougher defences in the PL than La Liga. He will develop more as an individiual at Everton. Whilst his development into Barcelona's first team playing style would obviously be better suited getting 15-20mins here and there at the Nou Camp.
Also the lad seriously needs to work on his finishing! Should have had more goals, Liverpool twice, Stoke spring to mind.