I think it is generally accurate observation that the amount of debate around a players abilities is a good indicator of their true standing. A truly outstanding player elicits little such debate although there will always be detractors especially during periods of poor form, they will be securely in the minority.
In latter years not many people would demur on the outstanding qualities of Arteta or Cahill for instance. McCarthy and Gana have been constantly debated however, and I think that is evidence that neither is entirely convincing because both are good but distinctly average players.
For me, I prefer Gana. He has the ability to not only tackle and harrie the opposition but frequently disposses them cleanly which allows a faster transition to attack, something McCarthy does not do as effectively. Offensively both are lacking, unfortunately ,but for me Gana edges it because he can play a forward pass far more than McCarthy who by contrast habitually prefers to pass sideways or backwards something that was noticeable in his Wigan days as well.
It’s all fine margins but perhaps the truth is that both are good enough for where we are but for where we aspire to be. In the end I would prefer to have a more rounded player in their position.
Given that McCarthy hasn’t played much more than 20 games in the last two years or so I won’t miss him if he leaves this window.
For me McCarthy will be defined by what may be his last action in a blue shirt, when he delivered a gut busting run followed by a brave and personally damaging tackle to save a certain goal. Unfortunately the reason it was necessary was due to his own poor passing in the first place.