This was our first cruise with Celebrity and we were excited about the previous things we have heard. I'll break my comments down by categories. Summit is scheduled for a makeover in January 2012, but it needs it NOW.
Ship Overall: While Summit is not the most beautiful ship on the exterior, the interior is very nice and has some interesting features. Most areas are well decorated and well appointed. There is adequate seating on the pool and other decks to accommodate the sun/shade worshippers, even on Sea Day. The ship layout is a bit unusual so it took us about a day to learn the best way to navigate the ship. Summit also does not have a full looping Promenade Deck. The negatives are all related to the age of the ship... worn carpet, chipping paint, warped railings, worn furniture, worn/threadbare draperies, dirty windows, mechanical/electrical anomalies, sticking doors, rust, and many other things that took away from the whole experience. The other thing that took away was the obvious lack of crew available to keep things picked up and wiped down. All week we saw dishes, glasses, fingerprints, greasy surfaces all over the ship. Someone had put a martini glass in a plant near the dining room and it stayed there all week! On another day we saw a coffee cup on the floor of one of the elevators and it was still there the next morning!
Food: The food in Cosmopolitan Dining Room was quite good and the portions were manageable. There were some interesting interpretations from the galley (e.g. Chicken Saltimbucca that was really just a stuffed chicken breast). Menu options were adequate as there was a fixed menu that was available everyday and a daily changing menu with other options. The one exception to this was the bread and desserts which were average at best and in some cases disappointing. The food in the Waterfall Cafe was good and there was adequate variety. The buffet/cafeteria style serving was easier to navigate after we learned to time it right. Again the bread and desserts were average at best, though they did have two stations serving homemade ice cream everyday and this was very good. We did not take advantage of Room Service nor did we go to the Fruit and Chocolate late night buffet that was held one night.
Service: Cosmopolitan Dining room waiters and sommeliers did a good job (not great). They were attentive but did not go above and beyond. Waterfall Cafe roaming waiters were a bit scarce. Bar Service was GREAT and all bar personnel were fun, cordial, and appreciative.