Your quoted "expected goals" statistic is useless as it doesn't count opportunities which don't lead to shots.
Cross which would put the striker 1-on-1 with the goalkeeper but the striker is half a step to late to get to the ball? No expected goal.
Player fucking up the pass wich would easily put the striker 1-on-1 with the goalkeeper? No expected goal.
Striker shooting from within the box from an amazing position where he is "expected" to score 9 out of 10 times position-wise but a great defender makes a last-ditch tackle to block and completely deflect the shot. Why should that be an "expected goal"?
Etc.
There are countless situations where teams can get past and open up this Barca defense easily which only the eye-test can confirm and that's why most are disappointed.
And even if by statistics we "deserve" to be where we are point-wise, it still doesn't imply that we are actually doing well. An "expected" scoreline of 1.8 vs. 1.4 vs. a team like Leganes isn't great at all.
First of all, vs Leganes the XG score is 1.32 - 2.81, which normally renders as at least 1-2, and in most cases 1-3.
Secondly, all the examples you mention are correct observations, but have nothing to do with xG, they are about the build-up. So, a striker who messes his steps and cannot take the correct position is causing problems in the build-up and that leads to less xGs. The same can be said almost about everything: good or killer passers create XGs, good strikers that know how to move in space create xGs as well. (One of the things you mention is not correct though. xG does not measure the position only where the shot is takes, but also may other factors like how many defenders of the opposition are in front of the ball etc. So possibilities of last-ditch tackles and blocks are calculated there)
So, yeah there are many factors that lead a team to have xGs and concede XGs as well.. One of these factors is the individual quality of the players. If you have a Messi in your team, it is reasonable to expect much better XG percentage than without him, just because of his individual quality. Look at PSG right now, who is skyrocketing xG percentages, mainly because of the individual quality of its players.
And the other factor is all about tactics of course. How to build a team that creates xGs through build-up and concedes little. Look at City as a current good example of this.
xGs cannot tell you if your buildup is good or if the individual quality of your players is good, but can tell you two things:
i) How lucky or unlucky you are in a game, based on divergence of final score from xG scoreline
ii) How effective or wasteful the finishers you have in your team are/ and correspondingly how effective or ineffective your GK is. Same for the opposition team
So, xG never shows that a team played 'well' in terms of beauty, fluidity, penetration, control etc. All these factors have to be confirmed by the eye (until more sophisticated statistics come up). But they can tell you at least if you played well in terms of i) and ii)
Other than that, i agree with MessiCam's statistical observations just below your post. TerStegen is maybe called up more times than what a team that is in full control of a game does etc. If i were EV, i would definitely bench Suarez is such a bad form and move Messi to false 9, but maybe i don't know much and what dangers might this entail..
PS: As for tonight's game, it think the first one since Getafe game that the opposition had better xG than us (even with small margin): 0.49-0.32
which reflects at least the fact that we were toothless upfront.
What i found interesting is the av position diagrams:
[tw]
https://twitter.com/11tegen11/status/933453379782758400[/tw]
Clearly iniesta's position is odd and asymmetrical, while Paulinio and Rakitic playing as internal mds, positions once played by Xavi, iniesta, positions which in principle both can play, but in reality are not even top30 players in Europe right now to do that. And relating to that: How many years have you had to see such a bad Barca roster? I think the first half without Messi, Juventus fielded a better XI in terms of individual quality than Barca