Winning against all those other teams are understandable, winning against Barcelona is different. I am not saying United will lose or anything like that, they could still end up being the winners, but at the same time I am saying that this will be harder than almost all of those home games, because they are facing a team that by all accounts should have been in UCL and not europa, they are a very good team.
United of course got better as well and they are very good but that doesn't change the fact that both teams will face very tough opponents and we have no idea how it will end. I still root for Barcelona obviously, but have to say it's equal powers fighting.
Manchester is prepared and can be able to win any team they face with the great form of Bruno and Rashford. Also having Casemiro in the midfield is a great boast to Manchester United squad. In the other hand Barcelona has skillful players that can be able to open any defence but Manchester United David De Gea is a top notch.
The opportunities for MU and Barcelona to qualify for the round of 16 are still equally open. However, the Red Devils certainly have advantages that might be very beneficial for them, namely, the advantage of away goals and playing at home. Apart from that, Erik Ten Hag also greatly benefited from the opponent's condition. Barcelona came to Old Trafford with a limp strength. Xavi cannot rely on Dembele and Pedri who are injured, while Gavi is suspended from playing due to accumulation of yellow cards.
Even though Barcelona are not favored in the second leg, I'm sure Xavi will instruct his troops to appear tough until the end of time. This season's Europa League is a competition worth fighting for by United and Barcelona. This second tier event in Europe can also be a springboard for the two teams to return to the top of success.