The Cottagers gave as good as they got on Saturday before conceding a second-half goal to Wayne Rooney.
Emanuelson was a second-half substitute after signing from AC Milan on deadline day and saw enough in the time he was on the field to feel positive about the future.
"It wasn't an easy game to make my debut in," he told Fulham's official website. "It was a tough match, but in the second half we really fought well and it looked like we would get at least a point.
"We fought as a team. You saw in the second half that we were getting stronger and stronger. We were unlucky in the box as well. But with the strikers they have, they can always score goals.
"We can be happy with the way we played but, of course, the result was not what we wanted."