I'll never understand comments like this, unless you have an encyclopedic knowledge of every player in world football which no one here does and is practically impossible for a top class football club, nevermind an individual, then it's an ignorant claim to make and simply cannot be substantiated.
We've signed loads of players not considered the "best on the market" over the last 10 years and yet we've had some of the best players in the world who have signed for us (e.g. Kompany, Silva, Fernandinho, De Bruyne, Aguero). Fernandinho for example was 28 when we signed him and still at Shakhtar, no real competition for his signature from what I can remember and he's been the best defensive midfield player in world football for 4-5 years, if not more.