I like Katy for her songs, but I don't think she is a very good live performer. Her performance last night were merely good for her standards. However, when it comes to stage presence and vocal ability, she lacks hard. I think she will continue to grow as an artist, but she isn't even in the top tier of today's top performers, IMO.
She's had several moments when she sounded great not acoustic, just to let you know.
Yep yep, Firework on Victoria Secret, when she stood there like a statue with her astonished vocals I don't say she's a terrible performer, but she can't reach the standard of a performance artist.