Warburton's side ran in 12 tries as Wales' winning margin overtook their previous tournament best of 72-18 against Japan four years ago.
Centre Scott Williams (3), substitute wing George North (2), Aled Brew, Gethin Jenkins, Toby Faletau, Jonathan Davies, Lee Byrne, Lloyd Williams and Alun-Wyn Jones all crossed Namibia's line, while Stephen Jones marked his record 101st cap by kicking 15 points.
"We got the bonus point, which is what we wanted," Warburton said on ITV1. "Namibia made it very tough for us, particularly in the contact area which was a bit of a disappointment from our point of view.
"But credit to the boys, we got 12 tries and the all-important bonus point."
Warburton added: "The game broke up in the second half and the boys showed their skills and we got 12 tries which will be important to our points difference."
Wales coach Warren Gatland said: "We started off with 22 points in the first 15 minutes, I think, and then the guys felt the game was all over, went to sleep and stopped being aggressive.
"They got a bit of a rollicking at half-time and came out in the second half and did the job. The impact off the bench was really good and overall, with the number of changes we made for the game, 11, I'm really pleased.''
Gatland added: "The disappointing thing of the night was the scrums were pretty messy, there were a lot of penalties, but we'll have a look at the tape and sit down over the next couple of days and look at the side for Fiji.''
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