How bizarre...I just watched this movie for the first time this weekend too. I had about the same take on it you did. I was expecting crap and I got something slightly better than crap. It was a mediocre movie that had some strange ideas in it. SPOILER ALERT:
They never explained why people's memories carried over after they were cloned. What's up with that? That was the only part of the movie I didn't get.
I liked the idea of why the brother wanted to keep power, but you would think they would treasure life a little more if they knew there couldn't be any new life.
Also, why would Aeon blow up the cloning balloon before they had the problem fixed? She could have been dooming humanity to extinction, which would make her a pretty nasty villain.
Overall, I didn't feel connected to any of the characters, and I didn't especially care too much about what happened them. I thought the gunfights, while entertaining, were laughably unrealistic. Standing in the middle of a round courtyard and spinning with two machine pistols in your hands does not kill everyone around the courtyard. It takes a lot of concentration to hit a target even when you're aiming. Most of those bullets would have either hit the dirt or flown over her attacker's heads.
Also, I didn't know they had a huge jellyfish-looking balloon flying over Berlin. I'm going to have to check that out sometime.