Well, one friend I know who enjoyed Jazz (but doesn't like playing online) dislikes the new look immensly, and that has put him off the GBA game slightly.

I gotta find somewhere that'll let me cash in my GBC so I can get a GBA.

On another note, all people's ideas about a Jazz sequel: Just update the old JJ3 to the Unreal Warfare engine. They're built on the old UT engine after all, and stuff from the old engine can be ported into the new one. Not to mention, all the cool stuff from the old JJ3 would remain.