The Dragons failed at the fundamentals, completing just 19 of 32 sets while Manly ran for 1837m compared to the visitors' 1117m.
Despite talk that Benji Marshall was back to his best after carving up bottom-placed Newcastle the week before, the Dragons playmaker had an awful night.
His ill-conceived chip-and-chase handed Manly possession in the lead up to Taufua's first and he threw the pass which was intercepted by Walker, who ran 90 metres to make it 22-0 at the break.
Dragons coach Paul McGregor would have loved nothing more than to have 16 clones of Tyson Frizell to put in his line-up, with the Blues back-rower's gutsy - albeit unsuccessful - chase on Walker the side's lone bright spot in a forgettable performance.
When Sea Eagles back-rower Jamie Buhrer broke through two tacklers to race 80 metres to score from a scrum in the 67th minute, it summed up the match.
Dragons forward Joel Thompson is also facing his third high tackle suspension of the year after collecting Luke Burgess, who was forced from the field, late in the game.
