Code Geass was epic. They need to make more shows like it... but anything that tried would just fall short. It's like the senien version of Tengen Toppa Gurenn Lagann - just too awesome to be in the same league as anything else in the same category.
I could go into a compare and contrast essay on the two right here and now, but that would be a waste of time.
One of the things I've always wanted to see is what Code Geass would have been like without Knightmare Frames, so I can't wait to get a hold of the AU Code Geass manga set in the revolutionary era.
The Knightmare of Nunnally was good - at least, what I read of it, but it just didn't seem to be as awesome as the original. To me, this was probably because it had less genius tactics, and more overpowered mecha... something that you see in just about all mecha anime, so a main reason I liked Code Geass was because it departed from that norm.
Not to mention...
ORENJI-KUN!