Norris was the only driver on the grid outside of the top three teams of Red Bull, Ferrari and Mercedes to land a podium finish this season.
However, he only did it once - in Imola, thanks largely to a Charles Leclerc mistake, and he admitted it was far below the team's expectations for the season.
To make matters worse, after a strong start to the campaign, McLaren struggled to for consistency and ended up losing fourth place in the Constructors' Championship to rivals Alpine Racing.
"A podium always means something. It means something to me, means something to the team. But one isn't enough," he said.
"One is like, we got lucky, and all of this stuff. You want to feel like you deserve to be there every time and we deserved to be there for sure. We weren't quick enough to be there. We were kind of way ahead of where we deserve to be.
"But yeah, one time isn't enough for me. It's not a good enough job by the whole team.
"We found it difficult. We've been quite up and down. We've had a weekend like [Abu Dhabi] where we've been quick, and then we were in Brazil, which was one of our worst weekends of the whole season.
"We've had one of the biggest lows, and then maybe one of the best highs of the year in the final two weekends.
"So [there is] a lot of understanding still for us, a lot of learning. But we need to take a step next year, we have to take a step, and I feel like everyone's putting in the effort to do so. Time will tell."