Now that Jay-Z and some other rappers are shunning Auto-Tune, Auto-Tune just became a little cooler.

You see, I'm all about staying away from trends, and staying uncool.

Auto-tune is good in: Techno and synth-pop.

See:
"Days Go By" - Dirty Vegas
"Closer" - Ne-Yo

It sucks-

In rap music, especially when it turns a rap into an extremely simple two-note melody. God, I can't stand little two-note rap song melodies (usually it's a perfect fourth with the root note and the fifth below it.)

In country music. And I can hear it all the time.