You would have those huge chunks of bone for your broth, and huge slabs of meat for however you want to prepare it. That’s so much freedom for how and what you want to cook.
Plus, one dinosaur egg could make like a dozen omelettes. There could be dino egg teppanyaki where one person breaks an egg and serves a dozen people.
My guess is that the taste of non-avian dinos would vary quite a bit:
large herbivores would probably taste similar to beef, venison and cheval, except really gamey. Because it's what people who ate ostrich say about its meat, it isn't chicken-like at all.
smaller ones could perhaps taste like birds? Specially if omnivorous.
Between skeletal structure, evolution and biology we have a damn good idea. While we may not know exactly what skin color adapted to a given period 70 million years ago in a certain region or how much feathers some might have had I guess I understood we had a compelling body of ideas drawn from research at this point for many species. What are the parts you're referring to that are so unknown?
Skin colour, patterns and feathers and scales heavily affect the appearance of the species. Also soft tissue, muscle and fat distribution. These things are hard to figure out from fossils. A lot of research is based on assumptions, we can guess what they most likely look like, but we don’t know for certain.
If we managed to make a computer model where you can input a DNA sequence and the model can produce the corrosponding organism, you could almost brute force it (run DNA sequences until your model comes up with a dinosaur that matches our fossils).