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.
She sang "Friday" without autotune. She is actually pretty fine as a vocalist.
This video shows that she has a relatively decent singing voice.
I Liked It Better When It Sucked: There's a faction out there that loved Friday because it was so horribly bad. It had terrible lyrics and overly autotuned vocals with generic pop music. However, "My Moment" was considered by by the public to be... listenable. It didn't have nearly the amount of cheesy fun the original had.
Misblamed: The lyrics and the abusive use of auto-tune were actually done by Ark Music Factory, the company that produced the music video, not Rebecca Black herself.
Though from the other wiki, she did chose this song, despite her mother's doubts. Rebecca's reason is that all the other songs are about adult love, which she haven't experienced it at her age at that time.
Win the Crowd: After the reception "Friday" got, she could have easily become a Justin Bieber-esque figure, but her healthy amounts of Self-Deprecation as well as genuine improvement in later songs means she enjoys a quite good reputation now, with the remaining haters being more of a Vocal Minority.
The Woobie: After Friday, the backlash hit so hard that people were bullying her in real life, with some going so far as to sending her death threats. She eventually turned this around by going on to donating the profits from the song to Japan's relief fund for the 2011 tsunami.