Indeed I have. Nice fellow, though.

Thinking more on it, the science fiction genre, while usually inhabiting the future and space and such, has the primary function of holding a mirror to the current human condition and human thinking (rational, emotional, or otherwise). Each character's personality represents a specific and exaggerated collection of human traits, and the interaction of those personalities and traits is what creates drama and helps us to relate to the drama, even in a bizarre and foreign environment.

When you have characters that are "impossibly happy," or otherwise don't have an "off switch," or almost never exhibit off-days, bad days, bad moods, are never in conflict with others or themselves, etc., they strike me as unrealistic, unlikely, and inhuman. I stop relating to them, at least to me. Contentment isn't something I'm terribly familiar with, nor does it make good fiction.