Not sure if you are asking me, but my opinion is that he is not and never has been worth a million quid.
He is a good League 2 winger who would be an asset for any one in the division and half of the teams in the division above, but he does not have enough quality to demand that type of transfer fee.
If we were offered a million last year then we should have snatched their hands off and then reinvested that money into players with potential.
Danny Rose, Alex McDonald and Matt Green have all previously been in similar positions with silly money being allegedly offered and if it had we should have sold them too.
The problem with many Stags fans (and probably all other clubs) is that they are too extreme with either praise or criticism. We always build them up only to knock them down again.
My opinion links into the 'philosophy' debate on another thread. We should buy them cheap, develop them.by giving game time and hope to sell them on for a profit. That is one strategy towards achieving long term success.