I think you might have had some bad ones. It's quite possible- they bruise and start to go off if you so much as look at them funny. Ideally, they have a mild,

I think you might have had some bad ones. It's quite possible- they bruise and start to go off if you so much as look at them funny. Ideally, they have a mild, sweet flavor, and the name 'custard apple' is quite appropriate. They aren't durian- there shouldn't be any strong flavors or smells present that might be off-putting.