People aren't really binary like that ... "competent" or "not competent". It's all mushy and complicated. Some of the most competent people I manage at some kinds of tasks are basically a net loss at other tasks. The pleasant ones are lot easier to work into diverse tasks and get a "competent result" even if it is more messy than just tossing them a task an forgetting about it.
I think that's orthogonal to pleasantness. The tasks I have in mind revolve around coding, since that's my job. If the job extends beyond coding, to gathering requirements or coordinating a team, I'd be more inclined to agree. But they don't, for what I'm thinking about.
