Wales limited the Springboks to just 40% possession in Wellington, which compounded the agony of their 17-16 Pool D defeat.
Bennett and company must beat Samoa to stay in control of their quarter-final destiny, with Wales coach Warren Gatland likely to retain the starting line-up that ran South Africa so close.
"It doesn't surprise me that our pack went so well," Ospreys forward Bennett said. "We've done a lot of work on our fitness and we've worked a lot on the contact area, so I expected us to be competitive.
"But it was nice to hear that we had 60% possession because we don't usually enjoy that much ball against these type of teams.
"In fact, I would be surprised if we have ever won that much ball against South Africa, but it has got to be backed up now."
Samoa launch their World Cup campaign against Namibia in Rotorua tomorrow and are viewed as serious threats to both Wales and South Africa, with just two quarter-final places up for grabs.
"There will be no complacency against Samoa," Bennett added. "We know their strengths and the quality they possess.
"It's also World Cup time and sides like them have a lot of time together, so they are potentially very dangerous.
"We know we will have to be on our mettle. They are a quality outfit who have played well this year, so we will have to be on top of our game."
Wales are preparing for the Samoa game at their base overlooking Lake Taupo, and the quiet calm is in stark contrast to last Sunday's heavyweight contest when both teams threw the proverbial kitchen sink at each other.
"There were plus points, but at the end of the day there was a massive minus point, and that is that we lost," Bennett said.
"We don't go into these games now looking for brave performances, we go into them looking to win.
"There were plusses against South Africa, but unless we back them up with a big performance against Samoa they will count for nothing.
"No-one is pointing any fingers at anyone. We win together and we lose together. You cannot doubt anyone's tenacity in our team.
"That is what we showed in the games leading up to the World Cup, and we showed it again against South Africa.
"The boys gave absolutely everything, but you just have to take it and make sure that next week our effort counts for more than a bonus point."
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