I think the way he has the text gives it a great feeling. The faces in text made me lol. Adding voice acting would ruin the point of the text and thus the faces.
when i first saw the post i was like oh no, not another noob posting his first animation.... then when i saw it i was like O.O EPIC!!!!!! i loved it great job, i think adding voice overs would ruin it too. I loled at "any one seen my balls laying on the grass, i need them for a date tomorrow"
EDIT: reminded me of Terkoiz
Yes it can. Why would you think anything can't hurt an animation? I'm surprised that people think lipsyncing belongs on blank faced stickfigures with text originally on them.
Thw way it is, it's better than some of what's on stickpage already, and I'm sure could make it. Great job.