The Blaugrana struggled to find their rhythm at the Anoeta, going behind to a Willian Jose strike on 53 minutes, only for Lionel Messi to equalise shortly afterwards.
However, Luis Enrique's men failed to kick on, and were lucky to draw, with Juanmi having a perfectly good goal ruled out for offside, while the Basques also hit the woodwork twice during the match.
With them trailing Real Madrid by six points heading into next Saturday's first El Clasico of the season, a despondent Pique admitted his side need to improve significantly if they are to have any chance of beating Los Blancos and challenging for the title.
"It's not often I can say this as a Barça player but we have to be pleased with the draw," he told Movistar Plus. "Sometimes you can win a game while losing your style of play but when you don't have the right attitude it's more worrying.
"Almost nothing went right for us today. They outdid us in the quality of their play and in attitude. We barely existed in the first half and improved a bit in the second but it's difficult to win the league playing like this."