Denis Betts aired his frustrations after Widnes lost their fourth consecutive match.
Despite taking an early lead, the Vikings fell short against Castleford, who recorded back-to-back wins in this 34-24 triumph.
Among several criticisms, Betts was unimpressed by his side's defence.
"Defensively we were slack from the start," he said.
"WBetts critical of Widnes following defeat
Denis Betts aired his frustrations after Widnes lost their fourth consecutive match.
Despite taking an early lead, the Vikings fell short against Castleford, who recorded back-to-back wins in this 34-24 triumph.
Among several criticisms, Betts was unimpressed by his side's defence.
"Defensively we were slack from the start," he said.
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