Port Adelaide great Kane Cornes has unloaded on young Blues star Sam Walsh following last night's loss to St Kilda.

The former No. 1 pick gathered 13 disposals in the Marvel Stadium clash and went at 56 per cent efficiency by foot.

The 2019 Rising Star winner hasn't quite backed up his sensational rookie campaign thus far, averaging 17.4 disposals, 1.6 tackles and 1.4 clearances this season, albeit in reduced quarters.

It has added fuel to Cornes' declaration last year that Power young gun Connor Rozee, who was taken four picks after Walsh in the 2018 AFL draft, is a better player.

Speaking on SEN’s The Captain’s Run this morning, Cornes criticised Walsh's disposal and reaffirmed his belief that the Blues took the wrong player with Pick 1 two years ago.

“I’ve been saying it, he’s not a damaging AFL footballer,” Cornes said.

“Carlton fans can scream from the rooftops all they like but he kicked it at 56 percent (efficiency). His metres gained are down, he looks to he handballing the ball (more) and isn’t going to be the damaging footballer that Carlton fans believe and have told me that he is going to be.

“They got that (draft) pick wrong and I think the Carlton fans probably need to admit that.”

The Blues started slow in last night's clash and never recovered, trailing by 32 points at half time after conceding seven goals.

Cornes was also highly critical of a number of Walsh's teammates, particularly in defence.

“It’s the same issue for Carlton,” Cornes added.

“Their defence was so poor last night. Defence collectively but also individually.

“Some efforts from Lachie Plowman who I’m surprised, to be honest, continues to keep getting a game at Carlton. As harsh as that sounds but there’s been significant moments this year where he’s just out of his depth back there.

“I thought (Jacob) Weitering had his poorest night for the year although he’s had a terrific season. He was well beaten by (Max) King.

“Petrevski-Seton is not a defender. I do not know why David Teague continues to persist with Sam Petrevski-Seton as a defender. He’s all at sea back there.

“(Sam) Docherty was tagged clearly and they had to move him out of defence. So the defensive setup was all at sea last night.”