The voice recognition itself was great on EndWar, it always recognised my speech without fail. It's pretty pointless in FPS games in my opinion but i'd love to see it in racing games such as NASCAR and F1.
Telling your Crew Chief/Race Engineer what type and amount of tires and fuel you want prior to a pit stop would be brilliant. Or asking your spotter pre-prepared questions in a NASCAR race.
'Who is in front of me?'
'You're gaining on Tony Stewart in the #14, he's 10 seconds ahead, keep pushing.'