The players who are brought in should be measured on what they bring to the team.
The players should be judged on how well they play and how they act in relation to the club.
At the end of the day, managers are given a budget and they spend it.
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And after they've spent it they must aim to have assembled or retained a full team and a full squad that gets results on the pitch and in the trophy cabinet. Which is how managers are judged.
I actually think this over-emphasis on transfer fees is one of the reasons that Wenger has escaped more stringent scrutiny. Wenger has brought in a lot of shit players. People just don't complain about it as much because we did not spend 30 million pounds on them.
It is indubitably true that overall we have had less to spend than all of our major rivals over the entire course of Wenger's tenure. His budgets have been lower, so his task in assembling a winning squad has been harder. If we have money now it's only because we've put it aside earlier.
I no longer think Wenger is the right person to lead the club but let's not pretend he hasn't made us richer.