The out-of-sorts Bulldogs were never in the contest against a ruthless Sharks team who went to half-time up 30-6 in the first game of Magic Round.
"Really disappointed in the first half," Ciraldo said after full-time on Friday night.
"We looked more like we wanted to look in the second half but you can't give up 30 points in the first half and expect to make a game of it."
Premiership hopefuls to begin the season, the Bulldogs could finish the weekend as low as 15th on the ladder, with seven losses from their past eight games.
The cut-off for a finals spot last year was a 13-11 record; the Bulldogs already have seven defeats in 2026 with 14 games to play.
It's been quite the fall from grace for Ciraldo's side, who were first on the ladder with a 9-1 record this time last year and finished the season as the NRL's best defensive team.
Canterbury defended only 14 red-zone tackles in Friday's first half but conceded five tries for it, and have now leaked 110 points across their past three outings.
"The reality is, defence is attitude and we're very good for long periods defensively, and then we take a moment off or we have an individual take a moment off and it's hurting us," Ciraldo said.
The Sharks' fourth try looms as one of the softest of the year.
In only his third NRL start, back-up hooker Hohepa Puru flopped out of dummy half past both starting props, fullback Connor Tracey and hooker Bailey Hayward.
Nicho Hynes' first-half try came after some similarly thin defence from the Bulldogs and the halfback left four defenders in his wake at close range.
"It's hard to explain it. They're very ugly moments," Ciraldo said of the two defensive blunders.
"If you wanted to make an excuse, maybe it was fatigue, but that'd just be bullshit anyway. We need to do better."
His NSW State of Origin spot under the microscope, Stephen Crichton showed flashes of his best, going in for the Bulldogs' second try from a 65-metre burst down the right edge.
But 150-gamer Crichton was caught way in-field ahead of Will Kennedy's try, with the sparkling Sharks fullback dummying straight through a hole to score.
Kennedy was busy all night as the Sharks responded well to Craig Fitzgibbon's scathing critique of their last-start loss to South Sydney.
"I'm obviously pleased in comparison to last week," said coach Fitzgibbon.
"I thought the boys walked in and accepted and took accountability, no sooks, just got on with some preparation for this week. No fuss about them."
Ronaldo Mulitalo scored two tries returning from the anterior cruciate ligament injury he suffered last October, first grabbing a Braydon Trindall cut-out pass.
After three consecutive forced dropouts, the right winger caught a cross-field kick from Hynes to score the Sharks' only try of a closer second half.
Trindall sent a last-ditch reminder of his talent to Queensland coach Billy Slater, scoring the first try after Kennedy outleapt Tracey and flicked out an offload.
NSW Origin contender Addin Fonua-Blake had 170 metres and 32 tackles.
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