I love CG and am not tired of it yet. To me, the medium of the story is not as important as the quality of the plot, and in The Ant Bully, the story was just too overdone to be satisfying. The graphics and sounds were nice, and it's a shame they were not paired with a more unique storyline.
Pros: The voices were expressive, and there's a different take on ants in this movie than in the previous ones. These follow the laws of nature in some respects but don't in others, so their world may not be as familiar or believable to viewers as those in A Bug's Life or Antz might have been. The CG is great, with nice details where they're needed, and there are different species of wildlife involved. Now if they could just move on to a new subject. No one's done a big CG movie about cockroaches yet...
Cons: The message of the movie is pushed a bit too hard. In many ways, it's exactly the same message as the one in the previous two ant movies. Ant Bully might be pretty interesting for anyone who hasn't already seen A Bug's Life and Antz, but you'll probably still yawn a little and say the magician ant's catch-phrase along with him when it's repeated for the third time.