The market has changed from last season, that much is obvious. We've got 18 year old kids with half a season of senior experience being touted around for 140+, I don't think we'd have been able to got Micky T for the same price in this window.
United are negotiating, which it is in their right to do, we don't know the details of what's going on. They could be holding out on the Perisic deal as they could be looking at other targets, or they simply might just be trying to lower the value (which all clubs bar the Arab funded clubs would do).
I don't doubt Mkhitryan's credentials before coming, but your claim was he didn't look like the player who could lead a team to a title, Mkhitryan didn't look that player either, especially with Bayern's continued dominance.
He absolutely could come to United and fail, just as any other player could, there's risk involved in every transfer. PSG could buy Neymar for 220+million, he could snap his leg in half and they'd look pretty fecked then. Also, I doubt 50 million would be considered a 'disaster', we're rich as feck, that's probably a minor dent in our transfer budget for the window, let alone a dent in our overall funds.
Lastly, no-one is claiming he's better. I simply said he's a good player and hardly average as the majority in here would make you believe. If what he has in his locker is what Jose thinks he needs to get a functioning team, then so be it. People are allowed to discuss as they please obviously, whether or not they want him etc. but claiming he's a bad or average player is just wrong.