Gothic3 Bad graphics?? in comparison with Oblivion!

My rig is:
MB: Ga-K8N-pro-sli
CPU Amd643800+skt939
Ram 1gb kingmax dual channel(2*512)
VGA: Atix1900gt
I have Gothic3 and the graphics are really bad. I have the latest drivers. I tried various settings in the game and in the Catalyst Control Center.
It appears that the game does not support antialising, and the textures are looking like those in some old game
Even with everything maxed out it does not look beautiful like Oblivion does.

I am not taking sides here but Oblivion looks like a dream when I play it on my rig.

I am interested to know if someone else has Gothic3 and how it looks.
If anyone has a rig that is similar or close to mine please share your opinion.
Can anyone with a highend rig tell me if they have similar problems.
I am also interested to know if Nvidia cards owners have problems , because I know that the game it is developed mostly for Nvidia cards

Thanks