Yeah, this really helped a newbie.
It's a bash-script with no readme or howto.
Of what I've seen that script only downloads the latest driver. And that I can do with Synaptic.
If you didn't read my post I can tell you that the performance in last graphic driver has dropped with 80% for me. I had steady 90fps in WaržoW before updating. Now it isn't even playable.
About World of Warcraft I have 0-10fps at 1280x1024 (all graphics on low, no AF). Before I had 45-80fps depending on where in the world I where and how many players/npcs there was around me.