Looking at the performance of Ecz, they actually didn't lose too many matches (but almost all to Vakif Bank). As good as Lang Ping for the Chinese NT, her team lost almost every match against the US NT in the Rio cycle (in the important tournaments). We cannot judge a coach by looking at his/her teams' performance against a specific opponent. That is not fair to him. Back to the match that Ecz got qualified to the F4 (when Thaisa was injured), he was doing a nice piece of coaching.
I agree with this in a way. It was the players' fault they lost to Fenerbahce in the TL playoffs as well, you can't blame Barbolini for missing 4 match points. If they had just beaten them they would probably have won the TL and nobody could really complain about Barbolini.
The problem is they have lost 7 straight matches to Vakifbank, the last 5 of which were easy wins for VB. It's not so much about losing to such a great team that VB is but the actual performances in the matches have been pathetic. Other teams like FB and GS have actually stepped up and challenged Vakif but ECZ simply can't compete with them for some reason.