So, I saw her live last night.
She was alright, I guess. I'm a fan of hers overall, but I chose to go to this seeing it as an experience.
The love from the audience was MASSIVE to say the least.
She was very good vocally, although I couldn't always hear what/how she was singing because of the sheer volume of the audience's voices singing with her.
What I found really funny is that she had to be accompanied off stage every single time (and she did that after pretty much singing 2-3 songs in a row). She moved awkwardly on stage (high heels, maybe?).
And at the end of the show, the floodlights were on, people starting moving towards the exits, BUT the lights were turned off again and she came out for an encore singing "I wanna know what love is" which got an amazing response from the audience (being a song not entirely known because of her, but oh well).
Overall, I'd give it 3,5 out of 5, just because it was Mariah on stage and she's a diva.