Im just wondering, because GTK doesnt run that great on my pc... for some reason the textures look completlety screwed up... among other problems. But JK2 Radiant looks good, runs good, and in my opinion is better. So will there be a JA radiant in with your mapping tools when(if?) they get released?

I am not sure but I believe that gtk radiant was used for JA.

Raven did use a version of GTKRadiant, not their own Radiant this time around - it made a lot more sense than re-creating Radiant again! So there will not be a JARadiant/JK3Radiant.

Anyhow JK2Radiant is anything but better than GTK, for a start make sure you have GTKRadiant 1.3.12 final from http://www.qeradiant.com/ .Secondly delete base\scripts and base\shaders (backup if you have any custom shaders in there). Thirdly be sure to uninstall any old GTK's before installing this new one (I always recommend this if people are having problems, it does help).
If you install GTK 1.3.12 now you can be sure none of the old stuff is interfering with it.

Your settings may be odd too, if you go into settings and look around you'll see stuff like texture compression, try other settings for it.

In the textures menu be sure the render quality is set to at least bi-linear if you want things to look smooth like in-game.

also make sure you have the gtk 2.0 runtime libraries

They come with GTK 1.3.12.