Luke Charteris believes Wales might have "got carried away" against flamboyant Fiji after labouring to a Millennium Stadium success that suggests next Saturday's experience against New Zealand could be all black.
Wales beat the South Sea islanders 17-13, but it continued a trend of unconvincing autumn victories over so-called lesser nations since head coach Warren Gatland took charge six years ago.
During that time, Wales have lost at home against Samoa and been held to a draw by Fiji, while wins against those two countries and Tonga were only achieved through scoring 17 points or less.
Wales' latest struggle was compounded by the fact Fiji had a player sent off - prop Campese Ma'afu - with almost 30 minutes left, yet they failed to score during a dire second-half and conceded a late interception try.
World champions New Zealand now loom large, with history stacked against Wales in a fixture they have not won since 1953, suffering 25 defeats on the bounce.
"We are disappointed with the performance," Wales lock Charteris said. "We got the win, which in the past we maybe have been guilty of not doing, so that is the first thing you will take.
"But certainly, the performance from last week (against Australia) has dropped off considerably.
"It is frustrating because we had a good week in training, and maybe we got carried away with who we were playing, trying too many off-loads and throwing the ball around.
"Credit to them, they were good in the contact, but that is a negative to us because we needed to retain possession. When we did, we put them under pressure all the time."