Widnes raced into an 18-0 interval lead and then contained the hosts in a see-saw second half to get their Super League campaign off to a flyer.
"Defensively we were outstanding today and that was the big factor for us. We had to get through a lot of work and I was really pleased to see how hard the players worked for each other," Betts said.
"That was really important for us as I did not think we did that well attacking-wise. But when we did create opportunities we took them. The key though was the attitude and that is something we are trying to breed among all the players at the club.
"We do have good players that are going to come back from injury, but everyone is fighting for their shirt at the moment and that is great to see."
Stefan Marsh got the Vikings on the board on six minutes, cutting inside to leave the home defence flat-footed. Further first-half scores followed from Jon Clarke and Dave Allen as Widnes took advantage of some woeful attacking play from the Broncos.
After the break London stepped up a gear with tries from Kieran Dixon (two) and Chris Melling, but Vikings scores from Frank Winterstein and Marsh again ensured they were nothing more than mere consolation.
With his side tipped for bigger things this campaign, Broncos coach Tony Rea cut a frustrated figure after the game. He said: "There are a different set of expectations at the club now compared to last season. We want those expectations, but we have to learn to deal with them.
"We didn't deal with them today and I was surprised by the error count. We must not dwell too much on this result, as all this tells us is how we performed today.
"We have to take a look at the game, look for solutions to the problems and find those solutions fast."
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