When you carry on for 3 years signing average players sooner or later it will take its affect.
The following players would struggle to holda regular spot in any top 3 team in the top leagues the way they are playing at the moment -
Cabellero, Sagna, Mangala ( to soon really to judge), Cliche, Kolorov, Fernadinho, Fernando, Navas, Milner, Nasri Dzeko and Jovetic
The players who have kept us up there are - Hart, Zab, Komps Yaya, Silva and Aguero.
Until we sign players on their level we will never improve. They have had no real competition for 4 seasons now. Considering how much we have spent since we first won the league we are really no better.