brownskin, I wouldn't worry. My wife and I are currently booked on the Triumph on 9/7. It'll be our third cruise on her--once in 2005 and then last December.
She may be 8 years old but she still looks great. Her crew is one of the best we've ever sailed with and we've been on 12 Carnival cruises.
We never had any problems with odor, brown water, or dirty carpeting. Every time you turn around someone is cleaning her.
I suppose as with anything else if you look for flaws you'll find them. Go with a good attitude and you'll have a blast.