First off, add me on PS3.
It's nothing like Mass Effect but the quality of it is on par.
There will be moments that will be disgustingly beautiful, and one of my favorite moments of gaming is at the heart of this.
Character wise, Andrew Ryan is one of the best characters in recent video game history. His philosophy is a whole other discussion itself.
The atmosphere, as you touched upon yourself, is what truly makes this game and is what's it all about.
Enjoy the ride.
"Fly away little moth!