Completely disagree about Emery. He might not be in the Guadiola league, but I think he's a decent coach who's inherited a club after 20 years of Wenger and one very lax approach and despite that has managed to get them playing a different type of football tactically. More aggressive, pressing better, working as a team better without the ball. They have shit/injured defenders and a side built for different style. Their record in big games was shit recently under Wenger, which they've changed a little and managed to not just outplay us but were more aggressive, energetic and cohesive than us (very much like today). That just didn't happen under Wenger during the Poch era. The bloke's got a good track record, got Valencia into the CL twice despite them having major financial difficulties and having to sell their best players (eg Villa, Silva). At Sevilla he won the Europa league three years running. At PSG he inherited a fucking circus, all he could do was what he did, one league and about 6 cups, was robbed of a CL victory over Barca by terrible ref.
Sarri's great, but again, he's walking into a club that's had a completely different mind set for years (Conte/Mourinho) and his approach needs complete player buy in and owner support - like Poch gets here - but what they've got is an owner who has the patience of a small child and players who know it.
I think he's making mistakes using Kante the way he is, he needs to switch to a 2CM system or just drop Kante and play Barkley, RLC, AN Other in his place. And I'm sure he thinks he's going to turn Hazard into the new Mertens, but that's probably folly too, because we all know Hazards prone to sulk a bit if he's not enjoying his football, and he doesn't like having to play as a false 9, it puts too much responsibility onto him.