There are mixed reviews that say the show is boring. To me, this is what I love about WDW -- the dining experiences with characters, entertainment, music, etc.... Dining at home is boring. Dining with a luau, belly dancing, characters, etc... is a lot of fun.
Spirit of Aloha provides something for everyone. It is a series of music and dances, all a little bit different. There's some "eye candy" for the men and women. Audience participation including a time for children to come on stage and try dancing. The fire juggler is near the end of the show and that was the best part -- so don't leave early! The food was very good - coconut bread, salad, grilled pineapple, ribs (very good), and baked chicken (never got past the ribs to try the chicken!).... Beer and wine too. And options for picky children including hot dogs or peanut butter/jelly sandwiches (have to ask for these things at your table).
The whole Polynesian Resort is awesome at night. I encourage you to walk around the resort after the show, especially along the beach between the volcano pool and the Tahiti Building -- you will enjoy the tiki torches, the hawaiian music playing from outdoor speakers, the lagoon and views of the castle. The MK fireworks are wonderful to watch from the beach. Grab a spot in a chair or hammock or on a towel. The lighted boat parade also passes by this area around 9pm so if you time your Aloha show right, you can go to the beach and see both. If your kids like Lilo and Stitch, the gft shop has lots of stuff. And the lobby is nice with lots of foilage and a waterfall.