Can I ask why you didn't like Boma? If it's because of the African inspiration of the food, you may find that Tusker house is equally unappealing. On my trip this past April, DW didn't like either, specifically because of the type of food. I enjoyed both, but Boma was far better overall.
Rainforest Cafe gets mixed reviews at best, and personally I'd stay away from it. (Although that is based upon many years old experiences, so take it with a grain of salt)
You might consider Yak & Yeti, but like most things, the reviews are mixed. I can't personally comment on the sit-down portion, but the quick service was fair to average.