JSMHE, the idea that anyone can evaluate any aspect of a player's game fairly in 2 games, especially for an international side, and reach any definite conclusions is ridiculous.
The first two times I watched Jaap Stam for Holland after United had signed him for a world record fee for a defender he looked distinctly unimpressive and nothing like the player the media and Fergie was heralding him as but I did not think due to those two games I knew anything substantial about him. In fact, I can honestly say that other than his fantastic performance against Brazil in 98 World Cup semi final, the first 10-15 times I saw Jaap play, he looked mixed in most of those games with some particular bad displays in that run(such as the Charity Shield, first home game of the season and away at Arsenal).
He developed into world class centre back and one of the best defenders I had ever seen at United and he was at the level after about half a season of first team football for United.
There's countless other examples.
There is a reason why most teams are very thorough in the scouting they undertake on transfer targets. It takes a long period of time to accurately evaluate a player.