If USA had the option for NOTA, would you use it in this Election?

Yes

Likely (though I might go for McMullin, as he's available in my state).

This is essentially equivalent to just leaving a section blank. I do that all the time for races that I don't know anything about. For example, I don't have any opinion on school boards and certain other local elections, so I leave those races blank.

Yes, without a second thought.