“Our attack was pretty perfect in that first half,” McNamara said after his team sprinted to a 40-0 half-time lead.
“But there are things we could improve on in that second half.
“However, I cannot criticise the attitude of our senior players over the past few weeks. It has been exemplary and although tonight’s game was a little easier than recent challenges, we can take a lot of positives from that.”
Mike McMeeken and Fouad Yaha crossed for three tries apiece in the first half, while James Maloney also touched down.
Joel Tomkins, Sam Tomkins (2) and Tom Davies stretched the lead even further after the interval, with Maloney kicking 20 points over the course of the game.
Leigh coach Kurt Haggerty was unable to make the trip to Perpignan because of passport issues, leaving his assistant Mickey Higham to sum up the night’s performance.
“A near-impossible challenge, especially when you go behind so early and give yourselves a mountain to climb,” he said.
“At one point it could have been a cricket score, but we managed to hang in there during that second half.
“When you make the errors that we did, missing tackles and giving penalties away, it takes its toll, particularly against a top team like Catalans.”