Yeah, it comes and goes in games for a reason. If it's not already some sort of social game, then the time to speak an answer is always slower than 3 button presses to select a pre-canned answer. Navigating a menu with Kinect voice commands will often be slower than a decent interface a user clicks through.
Voice interface only prevails in situations with hundreds of choices, and even then it's probably easier to use voice to filter down choices rather than select. But very few games have such scale to worry about (certainly no AAA game as of now).
Voice interface only prevails in situations with hundreds of choices, and even then it's probably easier to use voice to filter down choices rather than select. But very few games have such scale to worry about (certainly no AAA game as of now).