Well that's clearly nonsense anyway. McClean's been ok this campaign. Certainly better than, say, anyone in the centre of the park.
Here's a site which gives match ratings for all our games (and lots of other games too) and has McClean third on the list, albeit his man-of-the-match 9.5 rating against Gibraltar skews it a bit (as it does for McGrath, who played two of his three games against Gibraltar)
Still, quite clear he's not the remotely worst player to have played for us this campaign. Of those who have played more than 90 minutes, the list notes Collins, Molumby and Idah as our three weakest performers, and I think that's quite reasonable, all things considered.