I would say, given a little time to gel/mature/get used to the premier league, all of the following players are world-class:
tevez, silva, balotelli, dzeko, yaya, de jong, kompany, hart, kolarov (remember evra when he first started??)
and the following are top-class average, with potential to move up:
richards, adam johnson, assulin
and the following are top-class average:
barry, milner, kolo, lescott, swp
all we need is another cb that is as solid as vinnie and a little more depth in flair players (just one player for me), and we will challenge for the title next season.
----------------hart-------------
richards--kompany----cb-----kolarov
------de jong--------yaya---------
tevez----------silva--------balotelli
-------------dzeko--------------