My local healthfood market had oysters for sale today--first time I've ever seen them sold anywhere. I used your opening method, GS. The shells shattered and there were some shell bits in 2 of the 3 I ate. If I swallowed any I guess it's extra mineral nutrition.

The water in the oyster is a bit too salty for me, but the flesh is nicely tender and other than the salt the mild flavor was very good, and they hold together well and come out of the shell easily even when raw. I can see why they are the favorite of the shellfish to eat raw.
I also tried the wild scallops. They taste better raw than cooked (cooked taste to bitter and tough to me), but there's still a slightly off taste and they're slightly mushy, so I'm still not a huge fan--not as good as most of the fish in a sashimi platter, but better than raw shrimp (which are very mushy). Maybe it just takes getting used to. By drinking mead with it instead of water I was able to enjoy it more.
Mussels and shrimp are the only foods so far that I've encountered that taste way, way better to me cooked than raw, and mussels are much easier to eat cooked than raw. When raw, they stick to the shells and come apart in pieces and taste swampy. When cooked they taste scrumptous, hold together, come out of the shell easily and the swampiness is completely eradicated. I could eat 1000 steamed mussels or shrimp, but one raw one is one too many. Oh well, I guess it's oysters for me when it comes to raw shellfish, and the occasional wild clams, which are too tiny to deal with most of the time. Sorry if this upsets anyone. I try to be always honest.
If wild clams were bigger, they would be my favorite shellfish to eat raw.