These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Scrappy: Nikki is seen by some fans as this not only because she gets in the way of Melinda and Jim/Sam, which got better when Jim "returned", but her character also rubbed many the wrong way.
Moment Of Awesome: Melinda gets one in the climax of the season one finale, when she convinces almost all the ghosts resulting from the plane crash to go into the light - one of the very few people to stick with Romano, a female flight attendant, goes over in a season two episode - with so many going through at once that it actually becomes visible to Melinda (and the audience) for the first time in the series.