Too many to even list.
As a PP posted "nothing bad, but never stands out as a great meal. "
This is the best you can hope for IMO and maybe you are surprised on occasion.
For me things went down will in year 2 of the
DDP - up until then there were some amazing restaurant experiences IMO
With DDP the restaurants got a set amount and had to work within it.
Prices started to rise to make the DDP look like a better value and to also subsidize the DDP IMO.
DDP also caused the restaurants to be totally booked pretty much all time
Some of the more "unusual" or interesting items were removed from menus do to waste.
People ordered the most expensive thing on the menu not knowing what it actually was and would then send it back.
Those items were removed.
Disney started to standardize and things came from a central location - for a while every restaurant had lamb shanks prepared slightly differently.
Chefs are no longer planning menus or having specials - they are line cooks and get the ingredients from Disney
I tend to find the things not on the DDP are your best bet - for example the appetizers.
People tell me its gotten better in the last few years but I find that hard to believe.