Chelsea we're not good last season and yet finished above us (they had an awful run before Christmas where everyone was beating them and they couldn''t buy a win, something we haven't seen from them for years), they couldn't be any worse this season.
Man U weren't that good either to be honest, this season expect better as they seem to have invested a bit. City will be better for sure, Aguero is one hell of a player.
Liverpool have invested and have a more suitable manager in charge so IMO wil be stronger, Spurs have no CL which will make them more of a threat.