Oysters are lovely. I have two favourite ways of eating them...
The first is 'off the rock'. They should be picked off the rock (or in the UK off the chain or rope), cracked open, rinsed in salt water, squeeze of lemon and then into your mouth. Chew a few times, swallow and repeat.
The second is deep fried in batter. Sounds daft but oysters cook very well. One of my abiding memories of childhood in NZ was when we lived in Westport, which is a large oyster fishery area. We played basketball after school on a Thursday. Mum would pick us up in the evening, we'd go to the chippy and get oysters and chips, and then get home in time to watch Daktari on TV as we nommed...