I do think the Lallana/Herrera comparison is very off. Lallana has basically got Pogba's role in the Liverpool team, the freedom to go forward and create, whereas Herrera would be a fairer comparison with say Wijnaldum or Henderson.
To say United can't be an elite team with Ander Herrera in the side is very harsh, United were the best team in Europe under a decade ago with the likes of Anderson and Darren Fletcher being frequently used, and he's a "cut" above them. The team doesn't need to be filled with Hollywood players, having said that this is where I think Herrera gets underrated, he's much more than just a tireless workhorse, he has got quality too.
It wasn't his fault that Zlatan & co didn't have their shooting boots on against Burnley, Stoke & co. It wasn't his fault Rashford didn't track the Ox or our centre halves were outjumped by Giroud against Arsenal. It wasn't his fault that Fellaini had a braindead moment against Everton to concede that penalty. So if those very avoidable events didn't occur, and we were 6-8 points better off and in 2nd, as a team still gelling, wouldn't be hard to argue that we couldn't be an "elite" team with him? What Herrera can be accounted for, is bossing the midfield in practically every game, making up km after km for Pogba getting/being forward, and Carrick's lack of legs, and actually, his forward pass is really good; that assist for Mkhitaryan against Spurs, so instinctive, was a prime example of his vision and weight of pass.
If we have any problems with our team, which I can say we do not at the moment, it's definitely not coming from our central midfield. We've dominated every game with Carrick-Herrera-Pogba, with each and everyone of them doing their bit.