Wells, 24, was among a number of Roos who struggled in Sunday's 54-point loss to Hawthorn, but also lacked influence in the first two rounds against Melbourne and the Western Bulldogs.
"It’s not good enough," he said of his form on Tuesday morning. "I need to be a lot more consistent. It’s been the word of my career so far. It’s getting a bit boring."
However, he indicated that recent views from the outer had upset him.
"People who say things don't really know what's going on within the club," he said. "It's certainly getting a bit old.
"I was pretty spent [after Sunday's game] but there's probably times where I could have gone a bit harder."
Wells will seek to turn around his disappointment when North hosts Essendon at Docklands on Sunday.
Sidelined for two games with a knee injury last year, he found the best form of his career in the club's run to the finals.
He was also a stand-out in pre-season training but couldn't pinpoint a reason for his new frustrations.
"I'm certainly going to be working pretty hard this week to get back on the track and keep it pretty simple," he said.
Wells joined North as the No. 2 pick in the 2002 NAB AFL Draft and felt his high selection had generated lofty expectations from supporters and the media.
He denied there had been too much pressure but said that he was a couple of years' overdue on reaching his potential.
"It's only a number. Some of the better players get drafted later on in the draft and [become] champions," Wells said.
"There's been a couple of wasted years. There's still a bit of time ... but it can end just like that so I suppose I'd better get a move on."
He added that he hadn’t yet spoken to coach Dean Laidley about Sunday’s performance, but strong backing came from captain Brent Harvey, who said that Wells put himself under a lot of pressure every week to perform.
Harvey added that Wells' mental toughness was a clear attribute.
"He's overcome a lot of barriers in his life and in football as well," he said. "We'll back Daniel Wells 100 per cent.
"He's a very, very good player. He's just got to go to the next level now and become a great player at this footy club, and I reckon he can.
"Some of the games I've seen him play, he can certainly take it to another level."
Wells said that Harvey was someone he looked up to in his career and had been a good teammate to talk to.
"It's fantastic to have the skipper behind you," he said.
