I'd like to get these voice lines in game, I was up north in a work camp when it released, so I didn't hear/see it in action, the only one I thought that needed work was Warden, his didn"t really suit him, he sounded like a student from Harry Potter, I heard a lot of people not liking HL too but I thought it was good, it suited him.
I think it's a great idea to get some banter in while you're fighting, I think if the characters had more personality that people would find their true main, and really enjoy using him.