He's shooting 27.8% from 3, yet still chooses to shoot 5.4 of them a game. Same guy we saw last year. If you think that's what the team needs, then I don't know what to tell you.
If you think one stat tells the tale of any player's value, then I don't know what to tell you.
Here are some of Harkless' other stats for you to consider:
Overall, he is shooting the same as Sherfield: 41%.
He's averaging 18 points per game, more than any Sooner player.
He averages five rebounds per game (more than all but two Sooners).
He's tied with OU's leader (Sherfield) in assists.
He averages 1.5 steals per game, which is more than any Sooner.
He's shooting 78% from the charity stripe, which would tie him for third on the Sooners, but...
He's attempted 199 free throws--that's more than double OU's leader in that category (Sherfield's 96).
He's made 156 free throws; OU's leader (Sherfield) has hit 83. Getting to the line was always a huge part of Harkless' game, and it clearly still is. And of course it brings the added bonus of saddling the other team with fouls, which OU certainly could have benefited from this season.
Even in the category that many focus on when criticizing Harkless--his turnovers--he is averaging roughly the same number per game as Sherfield (Harkless averages 2.6; Sherfield is at 2.3--both averages are the worst on their respective teams).
Even acknowledging that Harkless has played easier competition, I think it's readily apparent that Harkless could have helped this team this season.