Of course she is. Everywhere in the world. She's one of the most successful artists ever and still got alot of fans, big endorsements, tours and other relevant things.
She's one of the biggest name in music and especially the pop/r&b world. People who voted no are haters or Jlo, Demi and Madonna fans.
I mean... Saying Mariah Carey isn't a legend is a bit stupid because everyone knows her and if someone doesn't, they will towards Christmas or towards their fave acts who mention her as an inspiration to pursue music.
Mariah Carey isn't well liked in my country but everyone knows her and recognise her talent... Her peak was HUGE. She is a legend everywhere.