The boards are full of negative reviews of 'Ohana, and of every other Disney restaurant, resort, and attraction.
'Ohana is my most favorite place to eat at WDW, hands-down. But that doesn't mean I walk into the place with rose-colored glasses on my eyes and pixie dust coming out of my ears; I still evaluate the service and quality with the same criteria I use anywhere else. Most of the time, 'Ohana rates very high on my scales. Other times, not so much.
I have gotten surly, inattentive waiters, and I once showed up 20 minutes in advance of my ADR (for one person) and waited nearly two hours to be seated (while groups of 2, 3, and 4 who had ADRs later than mine were getting seated in 20 minutes). And once in a while, some of the dishes are sub-par, too.
Complaints about feeling "rushed" are common at 'Ohana, but I believe that it's mostly a misunderstanding. 'Ohana likes to put lots of food on your table all at once, and keeps on bringing it until you cry "Uncle!" To some people, the fact that they haven't finished their appetizers when the meats start coming means they're being rushed, but in reality, that's just the way family style restaurants serve you. It's not serial; it's parallel.
I've also seen people complain about the large amounts of food that get put onto their tables, which they can't finish, and that this promotes waste. But again, that's a side effect of family style dining; it's all-you-can-eat, so 'Ohana (and LTT, too) tend to attract big eaters who want to consume mass quantities of seared animal flesh. If you're not a big eater, but still want to experience the bliss that is 'Ohana, all you have to do is tell your server when he first approaches that you would like smaller quantities of each item, and they will be happy to accommodate you. I usually get a single small dish of the dessert, instead of the normal separate dishes of ice cream and bread pudding.
'Ohana is a unique place that doesn't appeal to everybody. But everyone should try it at least once, and judge it on it's own merrits rather than comparing it to dissimilar places. Most people love it, so you have a pretty good chance of liking it, too.