Honestly, last time I heard anything about her career, her latest album was being sold for $4 on Grindr, so I wouldn't exactly say she has any relevance in the US as of late, either.
I remember liking her when she was on X Factor, but was never a big fan of her live performances of her songs. Scherzinger also had a background in theatre. I worry about Ms. Lewis getting lost behind the makeup.
I'm sure it's my naivety speaking, but if they weren't going to cast someone who would boost ticket sales, why couldn't it have just been a Broadway actress? Someone like Christine Dwyer, or even Alice Ripley might have done more to convince us jaded theatre people to give Cats a second chance. I'm disappointed all around.