There is no doubt that Leopard is the character who makes this series. Don't get me wrong, it's not like the other characters are totally uninteresting, but his Lelouch-like rants and megalomania (even as an AI) single-handedly raise the score of this show by a full point.
Don't watch this if you're looking for a lot of plot intricacy or subtlety, I found that the pacing can be a little ADD-mode sometimes. Then again that might be exactly what you're looking for.
This series has been somewhat episodic so far, though there is obviously some buildup for a larger underlying plot. In the most recent episodes it seems like we might be beginning to see the forming of something a little bigger. Despite being fairly light-hearted and silly so far, I'm inclined to think that things are going to get a little more serious eventually.
In short, it's an entertaining show to watch, not exactly time for deep-thinking, and it's a great way to get a weekly dose of Lelouch. ;)