Jess was inconsistent as well but like Zero, Strachan and Bell (going back a bit here but you know the type of player I mean) were the type of players you like to pay your money to watch.
You don't expect them to be good every game or even a whole 90 minutes but you cant bin them
What Millertime is saying is can we afford to carry Hartley who maybe does not have that one moment he can turn a game like the above mentioned rest.