I've never wanted to play that game as much as I do now that I know this.
I didn't realize it was him until I ran through the credits. It was just so unexpected. And he does sound different than he usually speaks and VERY different from Mal.
The voice was familiar and it drove me nuts.
He was a wonderful GL in Doom. And his Steve Trevor was dead on, and funny as hell.
Buck was pretty much an homage to Mal, which I don't mind in the least. I would not mind him for a VA in Mass Effect at all.
And maybe Bruce Boxleitner while we're at it? For any number of geek reasons.