Bielsa was frustrated by his team's failure to regularly maintain possession in midfield, while he never felt confident of securing the three points after Marseille went 2-1 ahead, as Metz spent long periods camped in the home side's half.
While Dimitri Payet scored a match-clinching goal for Marseille in second-half stoppage time, Bielsa claimed there was little to like about his side's performance.
"It's a game where we struggled to play well," the Argentine coach said.
"Winning, that was necessary; [it] provides satisfaction - more to the result than the manner."
The statistics did not exactly back up Bielsa's appraisal of the match - Marseille had 62 per cent possession and took 16 shots to Metz's 14 - but the 59-year-old coach was clearly unimpressed.
"In the second half we improved just after the equaliser. At 2-1, the game was balanced until the end," Bielsa said.
"Metz has been in our camp and we counter-attacked. We had dangerous actions but our way of playing was not clear."
Bielsa added: "We managed to have counter-attacks in the first half but we lost the ball too much in the middle."
