Again, I must repeat what we say on so many threads - the same restaurants you find on people's 'never again' list are going to be some of the same restaurants on people's 'must do' lists. Opinions and tastes vary, and there are good and bad days at restaurants.
I haven't eaten at ALL the TS restaurants at WDW, but I've eaten at most of them. (I will mention that we try to avoid anything having to do with burgers or plain old american cooking that we can get at home.)
Of your restaurants listed, I'd say Coral Reef's food is just okay. But not horrible. (I've never had a horrible meal at Disney and I've been going since the mid 1980's!)
I LOVE lunch at Chefs de France! Seriously - BEST french onion soup we've ever had. I would go just to get that soup! And our server was a doll! He had only been here for about a month, so we had a great conversation with him about his home in France and how he was liking the U.S. so far.
I haven't had bad food at Ohana, but I will admit we did have really bad service our last time there, so I haven't gone my last two trips.
I like Teppen, but there are so many hibachi places at home, so we don't do it often.
We've had two great meals at Yak and Yeti, but then again I LOVE asian flavors, and the restaurant decor is really cool.
I had a not-so-great meal at San Angel Inn three years ago, but we gave it another chance last summer and they hit it out of the park - it was GREAT! (And on trips before the one three years ago, we only had good experiences here.)
We also really like Tangeriene Cafe in Morocco. It's a must-do CS place for us. The shawarma is really good.
So, just a reminder to everyone, if a restaurant's menu looks good to you, try it! It may become your new favorite, even if someone else hates it!
