Miki is a good Midfielder, Even in Dortmund, he is number 1 midfielder in a club for a few years. No I think he is more than a really good midfielder, he is an awesome midfielder. I think he can be an option for the problem of manchester united this season and no need to sign another midfielder for January.
Mkitharyan is not the number 1 midfielder in dortmund and there are some other better than him. Marco reus is definitely much better than him and perhaps he is just currently having a good time at manchester united. There is no way to tell when will he turn into a flop anymore however I hope that he keeps this consistent performance
Some players have a slow transition when they transfer to another league. That's fine, but the media just keep making up stories about a player and brand them as a flop when really was needed was simple logic and patience. As Mourinho said all these "Einsteins" don't really know anything. They're just out there to get paid for writing any story that the public will want they think to read. While the players and managers are out there risking it all on the line just to put up a good show for the fans.