This is purely for pedantic purposes so your point still stands but it's 10 in the league and 1 in the league cup which was vs Oldham at home -
http://www.soccerbase.com/players/player.sd?player_id=72606
If he was "way out of his depth" he wouldn't be getting those goals so I don't agree with that, but at the same time, as I said in the discussion around him after the Blackburn game, with all the game time he's had this season, and very good service from the likes of McGeady, Horgan, and so on (none of which Garner got), making it into double figures is the bare minimum requirement for a striker like him.
Basically, I think he's done decent job this season and stepped up when others (Beckford and Doyle spring to mind) simply haven't, but ultimately I think we need better in the long run in this division.