I found this on the internet about her:
Celebration does look a lot smaller, older and less glitzy and glamorous when she is alongside newer ships in port, nevertheless, the Thomson product is popular among passengers who want a value-for-money cruise, with a British atmosphere. The ship has some of the traditional cruise elements, such as (optional) waiter service lunch and dinner and captain’s cocktail party.
Thomson has an army of loyal British cruisers who would never choose to sail with anyone else. Service is acceptable, although you may have to wait a while for a wine waiter in the main restaurant. Food is rather samey, although of an acceptable standard for most passengers. There is also paid-for restaurant, Sirocco’s (cost approx £15 per person). The ship provides traditional entertainment, such as West End shows, Austin Powers sing-a-longs and magic shows.
I would suggest that she is tending towards the "Blackpool at Sea" end of the market and another concern is that you are going to an extreemly hot environment where you will be very dependant on good AC. A ship of her age may struggle to meet your expectations.
There are however cruises for every taste and pocket nowadays so the first thing you have to do is identify these and not try to fit around a ship that you may have come across. If you want an older crowd there is Saga Cruises if you want cheap booze and parties then try Carnival. If you want scenery look at Alaskan cruises and if you have kids look at Disney Cruise Line, etc..etc..
I would first be sure of what you want then go and look at the hundreds of options available to you. At the end of the day you should be able to come up with something that very closely matches your requiremnts.