Emery has done well, couple of his signings have made an impact and you can see they have a little more bite about them now. He's been there half a season, you can't expect them to have been utterly transformed. Pochettino, Guardiola and Klopp all experienced tough first seasons in the league, and now it's arguably more competitive than ever.
They're still staying in the top 4 race, which is all that could have been expected by any reasonable fan given how much they spent. They don't have a better squad than any of the top four and I honestly think United also have a superior team on paper.
Emery needs money, and time to properly stamp his methods on the club, same story with Sarri. There will be hiccups with a new manager asserting a unique style. There is little he can do when they suffer serious injury issues and can barely cobble together two central defenders.