I don't feel like third party can win, because the historical precedent is close to nil for third party wins on a national level. Generally whatever side sends most of its voters third party, simply gives the other side the majority. But if someone genuinely sees no good options on the main voting ticket, I'm all for them following their conscience so they can be happy with their choice.
Me... Even thought I don't LIKE either main candidate, I dislike Hillary less viscerally. Some of the stuff Trump's said and done legitimately scares me, and he also seems like enough of a loose cannon I'm concerned what sort of diplomatic incidents he might set off. So I'm going with the option I expect to screw the nation over less severely in the long term.