Mikhitaryan is just another player who is unable take a game by the scruff of the neck - we have enough of those already. Personally do not think he will be successful at Arsenal.
I will miss Sanchez. He is the one player we've had for the last few years who tried things out of the ordinary. Sure, it doesn't always come off - but he's still one of the best in the world. He never dies wondering. Have always been a big fan.
Auba is an interesting one. Not sure where he will fit in tactically.
Personally I would like to see us go for someone like Seri - we desperately need shoring up in midfield.