It would be nice if you could make a mod that increase the time between voiced objective reminders. Or easier way would be replacing all objective reminders with silence.

Basically, any map that can be stealthed got objective reminders, way too often, so no matter how good they are if you hear it every 20 seconds, it will get annoying very quickly.

Most noticeable are:
Tiger Trap - Before planting dynamite on the tank
Rogues Gallery - After securing first painting (reminder to leave)