I don't like duck eggs scrambled. They are a bit...grainy or gritty. They are AWESOME in baking. The albumen is very stretchy so they work great in breads and cakes. My wife makes an awesome pumpkin pie with a lard crust and duck egg custard. I eat it hot from the oven before it's even set. My wife gets very angry.
Goose eggs are sweeter than chicken eggs. Goose egg salad tastes just like chicken egg salad but sweeter. Markedly sweeter. I served a huge bowl of it at a party with fancy crackers allaround and everyone commented that it was delicious but sweet.
Turkey eggs taste just like every other eggs. Turkey egg salad is indistinguishable from chicken egg salad.
Quail eggs taste like little chicken eggs. They're annoying as hell to eat because they're tiny but they're fun.