The defender was unimpressed with the South American side despite Lionel Messi & Co's victory over the Red Devils, which sent them crashing out of the tournament
Gonzalo Higuain's first-half strike was enough to send his side through to the semi-finals for the first time since 1990, but Van Buyten was not impressed by the South Americans, despite their victory.
"This is bitter for Belgium," the 36-year-old told ZDF. "We lacked experience.
"This is a big tournament and experience is very helpful in these occasions.
"Of course Argentina have superb players, but I think a team like Germany would easily beat them."
Meanwhile, team captain Vincent Kompany was keen to take the positives from Belgium's World Cup campaign.
"We really gave it our best," he told Sporza. "It was a wonderful adventure for us.
"The most important thing is that we gave everything. Maybe in four years' time in Russia we will get another shot.
"We have the youngest squad of the tournament, we must not forget that. Maybe we will have more luck in Russia, and we will definitely have more experience then."