Jamie Roberts says there is "more to come" from Wales after they retained their Six Nations crown on Saturday.
Wales thrashed Grand Slam hopefuls England 30-3 at the Millennium Stadium to claim their second successive championship for the first time since 1979.
But while they have proved themselves the best in Europe, they have struggled against southern hemisphere opposition in recent years.
In 2012 they lost four times to Australia as well as losing to New Zealand, South Africa, Samoa and Argentina.
But Roberts is confident the competition within the squad means they will continue to improve.
"I think there is more to come - that's the scary thing," Wales centre Roberts said.
"Our defence is outstanding, there is more to come in attack, and competition for places is very good in the squad. That is what drives us forward as a team.
"When you have got competition like that, you are on your toes and you are only ever a game away from being dropped. That is what drives us forward more than anything - that competitive edge.
"You don't win championships with 23 players, you win it with 35. Guys like (lock) Andrew Coombs, who would be disappointed after losing his starting place after the first few games, have been magnificent in this tournament.
"It's guys like that who win championships, guys who are maybe holding the tackle pads in training and put in the hard work when they're not in the starting XV."
With a neat sense of symmetry, Wales beat England by exactly the same score they trailed Ireland by after 45 minutes in their opening game six weeks ago.
Although Wales lost that encounter, despite then scoring 19 unanswered points, they bounced back by winning three successive away fixtures before reducing England to rubble.
Just as significantly, no team has scored a try against them for almost six hours, which showcases the brilliant strategic brain of defence specialist Shaun Edwards.
"Chatting to a few of the boys, if anything it's a better feeling than last year," Roberts added.
"From where we've come from in that first half of the Irish game to winning on the road - three on the bounce - and finally delivering at the Millennium Stadium, it's very pleasing.
"We took a bit of a beating from a lot of people after that Ireland game, and certainly the run of results (eight successive defeats) leading up to that. It was a very hard place to be.
"But it just goes to show the resilience of the boys. Rugby is 90% attitude, and the resilience the boys have shown during the last six or seven weeks has come to the fore.
"To concede just three points against a team of England's potency is very, very good for us and a tap on the back to Shaun Edwards.
"From a personal point of view it's been an absolute privilege to work with him. He's a great character, he knows his stuff inside and out, and to learn from someone of his calibre is up there with one of my greatest experiences as a rugby player.
"To see him smiling at the end was very pleasing. It's a better buzz than last year, if anything, because our games have been built on solid grunt and attitude."