Well, like it's been said before, I think a thread like this will eventually list all the places on site.
That being said, I'll contribute my thoughts.
Boma, Akershus and Morroco seemed like quality food, just not up my alley. Actually, I say that and I enjoyed all 3 better than the rest of my family who didn't seem to like anything.
I must not have my expectation too high for buffet's because I've never had a bad experience at any of the buffets at WDW. It's pretty easy to avoid the food that's been sitting for a while, and get the fresh stuff. I've eaten at 1900, CP, Chef M's and Cape May Cafe, H&V. I found them all to be fine.
LTT is one of our favorites. The kids love it and I think it's fine. It's our comfort food.
Now, as far as not good, in quality...I was very disappointed with Sci-Fi. The ribs were horrible, I may have caught them on a bad day, but yuck. Also the onion rings weren't very good either, and I think DW's chicken pasta was icky too. However DD's cheeseburger was good and the atmosphere is way cool.
Also Coral Reef was disappointing foodwise. I wouldn't say it was bad, but certainly not worth the money.
Actually, DW and I are trying to hit at least 3 new places each visit (Gotta love the dining plan, even with the dummied down menus) and the only places that we've eaten that we would pay to eat at again (other than the buffets) are Ohana (DW's favorite), LeCellier (DD and My favorite) and Spoodles (DS is into the buffets, he's all about the characters, not the food). We haven't tried any of the 2
DDP credit places, other than Artist Pointe (back when they had character meals at breakfast), so I can't really comment on those.