England international James Simpson-Daniel felt embarrassed after Gloucester's 22-16 loss to Sale handed the hosts a poor start to the Premiership season.
"We've shown very, very short glimpses about what we are about, but it's embarrassing," Simpson-Daniel told BBC Gloucester.
"We've got to face up to the fact that it wasn't good enough.
"It was horrible for everyone involved. It leaves a bad taste in the mouth until the next week when you can try to put it right."
The defeat was Simpson-Daniel's first competitive clash since a shoulder injury put him out of action 10 months ago.
"I feel absolutely fine," said the winger after the game.
"On a personal note, if there's any positives to take from it, it's that I feel good and there's no issues there."
Simpson-Daniel is well aware that the task doesn't get any easier for the Cherry and Whites. Their next challenge comes in the form of last year's regular-season winners, as they take on Saracens on Sunday.
"We're going to have to get our heads down and do our analysis," he added.
"There's no point in feeling sorry for ourselves, although I don't think anyone is as we're too angry.
"We're all frustrated and we need to show that next week."