Boma is one of my personal favorites, but it may not be for everyone. Here on the DIS, things go through cycles. About 18mos. ago, there was much hype for Boma, and then about two months later, there was much Boma-bashing. Take your pick.
The staff is really nice if you have any food restrictions, don't be afraid to tell them. Boma's menu alternates every other night, too. My favorite is the night they serve the butternut squash soup! Another nice thing about Boma is that you can try as little or as much of the exotic items as you like - you don't have to commit to an entire meal of something exotic. If you don't like it, go back and get more french fries and meatballs! (exotic itesm include things like hummus, butternut squash soup, and fufu, which is just mashed white and sweet potato mixed together. they also have some slightly unique sauces for the sliced prime rib, but you can also eat your meat plain.
I've never dined at Jiko, but I've looked at the menu many times and thought about how much the menu at Boma appeals to me more, with a lower price point.
I've also never tried 'Ohana myself. Usually I go to WDW with my vegetarian sister. Last fall she took a trip to WDW without me. Imagine my surprise when she said she was going to eat at 'Ohana (To be fair she kind of got in on
free dining promo at the last minute, when dining choices were somewhat limited.)
Anyhow, her thought was that it was a LOT of meat. As it's served family style and she was in a party of two - I think they got plenty of meat! Her boyfriend thought it was good though. he wasn't too intothe sausage, but everythign else he thought was good.
I'm finally trying it myself in September!