What exactly do you not like about Barcelona that they conceded 4 goals? So they missed 3 of them in one match with Villarreal and by the way they won this match, but it was the kind of match when the teams went for a counter game, Barcelona rarely allows this. Barcelona sticks to their previous strategy, they play well in defense and do not try to score many goals, their main focus is on the result. Quite a good start to the season, one draw and three wins, so I don’t see any big problems for Xavi’s team.
I do agree that they are fine, and looking at their results so far this season, they have been fine without a doubt, just because they got some goals scored on them doesn't mean that they are bad, when you look at the results you see how good they are.
Xavi is doing something that is systematic change, and I feel like that is going to take some time and requires the team to get some adjustments to it, and because of that we are going to end up seeing it change a lot, and may have some hard times. Just because they won it last year doesn't mean that they are going to keep winning neither, it is going to end up changing a lot until they find the perfect balance, last year was pure talent, this year it will be the strategy that makes them win.