The Wales international refuses to accept the Canaries are exceeding expectations.
"We don't think we're over-performing, we think we're under-performing if I'm perfectly honest. We could have been so much better in games," he told Pink'Un.
Morison, 28, who has scored three times in the last six games for City, said: "We are doing OK, we are 11 games in now, but there is a long way to go.
"We are not resting on our laurels. It was a poor performance against Aston Villa on Saturday, so we have to get better and that's what we will try to do."