Barcelona did not play too bad in Champions League but they missed some chances and made some mistakes so they must accept the fact and prepare better for the next season.
Yeh bro I am totally agree with you that Barcelona missed too much chances to score because due to new manager Xavi most of the starting XI is new and yound player which hasn't a champion league experience like Thier old player like Messi, Suarez, iniesta etc. So that the reason due to lake of champions league experience the young player didn't perform well and missed too much chances .
Hope after few seasons when Thier chemistry build and get some champion league experience they will perform well....