Well, considering the age of INXS, maybe a 21-year-old host wouldn't be appropriate.
Having said that, the show could probably do without her. She doesn't add anything to it, IMO, and when I first heard who was hosting I said "Who????" As for her clothes...well, anyone standing in the same room as Dave Navarro of the feather boas and nail polish looks pretty stylish by comparison.
The only outfit of Brooke's that I really hated was last week's green dress and around her neck, what looked like the macrame plant hanger I made in sixth grade Sunshine Frolics. Otherwise, I guess she's no worse than most reality show hosts.
ETA: Signed, a 30+ hag.