They're second most favorite to win the Europa League trophy. However, this only reminds me of last season's narrative. They being placed at the top of club to win europa league, but failed during the play off stage. I'm only thinking same narrative to happen for the twice.
You are right. Manchester United have won three matches in the Europa League. Manchester United have failed to win against Fenerbahce, Porto and Twente. If Manchester United want to win the Europa League title, then it is very important to play better. If they perform like this, Manchester United will be eliminated in the knockout round.
This season, I do not think that it will be possible for Manchester United to win the Europa League title. Manchester United's performance in both the Premier League and the Europa League is irregular. There are teams more worthy than Manchester United to win the Europa League title.
Manchester United won against Arsenal in the FA Cup match. But was Manchester United's performance good? I would say that Manchester United were very lucky because they were able to beat Arsenal in the FA Cup match. The performance of United players was quite poor throughout the match.