Rami Al Hajj marked his first Argyle start with a goal after eight minutes, before sub Ibrahim Cissoko then scored twice in the second half, either side of Victor Moses’ reply for the visitors.
Rooney said: “We had a lot of young lads in there, and I am delighted for them.
“It was a good performance for different reasons; in the first half we controlled the tempo of the game.
“Luton tried to press us and when we played with composure and through the press we caused them problems.
“Second half we were a little sloppy and gave the ball away a little bit too often, but our back four were excellent.
“We showed great character and desire to head the ball… and then the attacking players get all the praise because they score the goals.
“They were good goals as well. Rami, first start and great finish from him, and then Ibrahim came on and scored two, so a good night.
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