Mikel Oyarzabal led the way as Real Sociedad won 2-1, but Espanyol's Manolo González was left fuming at his side's defensive frailties, particularly from set pieces and in transition.
"With the move for the 1-0, which really punishes you, you're already playing catch-up from the fourth minute. From there the game gets complicated and it becomes the same story again," González said.
"We talked a lot during the week about defensive positioning, about the Oyarzabal situation, the shape behind the midfield line - that's why Moscardo came on in the second half, and I think he did well. There were a lot of lost balls, situations with no real pressure where we gave the ball away easily."
González was particularly frustrated by the manner of Real Sociedad's second goal.
"Today I think the game wasn't good, that's clear, but mainly because the players weren't good - collectively they weren't good and individually they weren't good either," he said. "The danger came from us, through lost balls, without excessive pressure from the opponent, and through poorly defended positioning.
"Today we were bad and we conceded a lot of counter-attacking situations, which really bothers me. What bothers me most about today is that we conceded two goals from counter-attacks."
He also criticised his side's application in individual duels: "More than half the team not winning individual duels simply can't happen in the top flight," though he praised half-time substitute Moscardo's contribution.
Matarazzo, for his part, was delighted with the result on his first home match in charge, even if he was left baffled by his own dismissal.
"Today's win was very important, because it was our first game at home, with our fans - it was the first chance to connect with the supporters, and although we had some difficulties, we got the win, and I think the team's performance was very good," he said. "We'd talked before the game about how important it was to win again, and I'm happy about that."
On the red card itself, shown during a stoppage in play involving the goalkeeper, Matarazzo admitted confusion.
"At the time I was surprised, because I didn't understand why he'd shown me the red card. It's a new situation - when the goalkeeper is being treated and a player has to be sent off the pitch. We were deciding, and he sent Zubeldia off, it was a complicated and emotional moment," he said.
"He could have warned us there were a lot of people protesting in the technical area, or even shown me yellow, but he gave me red, and I think it's a harsh punishment - again, it's a new situation."