I agree that they were decent, but remember that we have seen Liverpool lose to Atalanta 3-0 when they were the leaders in the league, that should tell you how hard these competitions are. Of course they dropped to third place later on but that doesn't change the fact that we had them at the top during the time of the loss, a team leading premier league would be expected to beat most teams in the world, including UCL teams too, maybe not Real Madrid, but there aren't that many teams leader of premier league could lose to, and yet they lost to Atalanta.
So saying that United is good right now is true but also they could lose is once again true as well. Just because they look good, doesn't mean that they are going to win it, so much so that even if they end up being somehow incredible and win the premier league and shock the whole world, that still doesn't mean that they will win this one too. You have to play game by game to see how it will end up.
Liverpool's defeat in the Europa League against Atalanta last season was quite surprising, not only that because they also lost with a fairly big score at that time. So just like the others, the Europa League is also quite difficult to predict.
Talking about Manchester United, actually every season the squad they have never lacks good players, but for some reason the players can't show their best abilities.
I think this has something to do with the strategy that is applied, maybe it's not suitable for the Manchester United players so they can't show their best performance.
When Liverpool qualified for the Europa League last season, we naturally discussed before the start of the season that Liverpool might do the best in the upcoming Europa League tournament and the most likely to win the title. Although we had already assumed that, Liverpool had a terrible performance in the Europa League and did not qualify for the semi-finals. There is no Liverpool this season, but Manchester United has qualified for the Europa League again, so we consider Manchester United to be the strongest team for this tournament. However, not always a team can perform as per our expectations, but the good news for Manchester United is that the two teams that were champions and runners-up last season are not in the Europa League this season and they have the potential to do well. Manchester United manager must take every match of the tournament seriously and perform according to the plan only then Manchester United can do well in the European League tournament.