Maybe you mean UEL not EPL because in EPL there is no term for the final round and for Manchester United the team is actually only not good when competing in the EPL, but in the Europa League Manchester United has done their best to be able to qualify directly for the last 16 so that the team must also be considered as a team that has the opportunity to become champions in the Europa League this season. Although the three teams you mentioned are clearly strong candidates for the Europa League title this season.
I don't think Manchester united is a team that deserves to win the europa league. Manchester united played well in the first round. However Manchester United's opponents in the first round were not that strong. So it was a bit easier for Manchester united to perform well. But Manchester United will play against strong teams in the knockout round.
However I would say Manchester united is a bit lucky. Manchester united will play against Real sociedad in the round of 16 match. Real Sociedad is also not in good form. So united has a chance to win. However it cannot be said that Manchester United will win. I have no confidence in Manchester United's performance.