#1
I bought a crappy hdmi cable, thinking it would be oky since its only a cable, and i got gta4 and it doesnt look fantastic, anti aliasing is ugly, and its running on a 32" lcd hd.

Should i get a better one?
#2
Make sure all of your settings on your console are set for HDMI. Other than that, I wouldn't know how to help. So I guess yeah, get a better cable.
"There is more stupidity than hydrogen in the universe, and it has a longer shelf life."
-Frank Zappa

"Where words fail, music speaks."
-Hans Christian Andersen
#4
There are different types of HDMI cables, look them up, see which one you got...and which one you require.
#5
There have been proven tests that only support the more expensive cable if it is over 12 ft. Otherwise there is no difference. HDMI cable prices are overinflated. I could look up the experiment if you like.