We once hired a field tech who wasn't very good at anything. He would go to the client's office, look at their PC, declare nothing could be done and then go outside and shoot the shit and have a smoke with the client and leave without fixing anything. The clients fucking loved that guy.
We hired another guy. Aspergers, neck-beard, super-tech type. This guy could fix any problem he was sent to deal with. Clients phoned up and said although he fixed their problem, they'd prefer that we send the first guy instead because they felt he was a better technician.