I liked all of the routes, but Haru’s was my favorite just for the after-credits. I liked the route for the same reason I liked the whole of the VN. There was lots going on, and lots of hype during the story. The characters were good, and there was mystery.
If you want a well-written story go read Sharin no Kuni. That was better written, but G-Senjou was a better VN.
Totally wasn’t a plot twist. Just bad writing.
I don’t watch over-hyped stuff, so I wouldn’t touch CG with a 10 ft pole. I loved Guilty Crown, but everyone I know who watched Code Geass hated it. I’m enjoying Aldnoah somewhat, but I’ve heard CG watchers bash it. CG is a ruiner of other stories.