"I'm not at all impressed by Argentina," Wilmots told a post-match press conference at Brasilia's Mane Garrincha National Stadium.
"They're a very ordinary team with one extraordinary player," he added, in an apparent reference to Argentina captain Lionel Messi.
Belgium struggled to create chances after falling behind to an eighth-minute Gonzalo Higuain goal and Wilmots was unable to disguise his frustration at the outcome of the game.
"We saw Argentina's experience," he said.
"They break the rhythm, they take 40 seconds to take a throw-in, and they're never brought to order by the referee.
More From This Section
While Argentina also hit the bar through Higuain and saw Messi thwarted by Belgium goalkeeper Thibaut Courtois in an injury-time one-on-one, Wilmots did not feel that they were clearly superior to his team.
"We can always expect more, but we expended a fair amount of energy against the United States (in the last 16)," he said.
"And them (Argentina), how many shots on target did they have? If I'd done that, I'm sure the Belgian press would have criticised me for not trying to play."
"I'm talking about the team as a whole. I don't want to talk about individuals," he said when asked about Hazard's display.