video card driver necessary?

[yk]

Hi,there.
I've been wondering the question "Is video card driver really necessary 
for my Linux box?(quite dummy,I know)" since the very first time 
installation of Fedora~
I mean,the  universal video card driver sailed with fedora is good.
What's more,I broke my fedora when I try to install a ATI driver once~
So would you guys let me know  is there *any* goodies that a video card 
driver can do to me?