'Ohana (apostrophe at the beginning, no S on the end) is my favorite table-service meal at WDW.
The food is great, the atmosphere is relaxed and easy-going, and there is some nice entertainment each night (hula-hoop contests and coconut races and some relaxing live music).
'Ohana is all about mass quantities, so if you are not a huge eater, be sure to tell your server to bring smaller quantities is you don't want to waste a lot of food.
Food at 'Ohana comes in waves; you may get two courses within seconds of each other. This does not mean that the server is trying to rush you, it's simply the way they bring out the food.
When I go to 'Ohana with a group, it usually takes 90-120 minutes to complete our meal. Take your time - there is a lot of food, and it's all worth trying.
And whatever you do, be sure to save at least a little room for dessert, which is bread pudding with vanilla ice cream and bananas foster sauce. It is the single greatest sweet treat at WDW.