When I say Roma played well I mean they dominated the match. In this match we saw the dominance of Roma players. Roma players have 75% ball possession in this match. At the same time, Roma players have been able to attack a lot. Roma players created a lot of scoring opportunities. But even then Elfsborg's defense failed to break down Roma. Roma players made a total of 23 shots in this match. 5 of these were on target. Elfsborg players on the other hand made only 6 shots. And all four shots were on target.
Roma failed to win in the first two matches. Whether this team can do well in the upcoming matches cannot be said for sure. It is well understood that the performance of this group is not very strong. Roma will face Dynamo Kyiv at home in their next match. This group is quite strong. Despite being a home match, it is very difficult for Roma to win against Dynamo.
You specified that Elfsborg had 6 shots on goal but you didn't specify that 4 of them were on target while Roma had only 5 of 24 shots on target. We've seen a lot of unexpected results this week and the Europa League has always been full of them. Dynamo is too weak now, Roma will probably be able to win that match, but Roma's opponents in the remaining matches are really tough, with De Rossi gone the team's problems haven't gone away. Manchester United could have done much better if they had kept a clean sheet longer but I didn't expect them to beat Porto, a draw in a match like that is not a bad result.