"We were filthy," said hooker Elijah Taylor of the loss. "We didn't train that hard to have our first game like that. We were all disappointed."
The Warriors missed 36 tackles as Parramatta ran in seven tries, something Taylor attributed to miscommunication and poor technical choices.
"It's all about a defensive attitude and we all need to work hard on it," he said.
"We need to be more patient in our tackles. We were making tackles but we were putting them on the deck straight away.
"We need to use the time and slow it right down. Get two up top and the third person gets the legs and we'll get them down slowly."
Handling errors also proved costly against last year's wooden spooners, a side who, under new coach Ricky Stuart, look to have been transformed and played some excellent football.
After falling behind 18-0, Pita Godinet provided something of a spark when he came on and helped his side claw their way back into the game, but the Warriors were badly exposed in the final 20 minutes.
Their fitness continually came into question as they fell away in games last season, but Taylor denied that was an issue after a strenuous pre-season.
"We've forgotten about 2012 - that season's over and done with," he said. "It's early days and early season - round one."