I didn't know the review copies went out friday. I only read some reviews from IGN, Kotaku and other sites like those. I also didn't believe what they said about how long the game was. Maybe if you only played the story quests then maybe, but you're right about experiencing the ambiance of the game and going through the side quests.
I know what you mean about seeing no end. I'm 13 hours in and I got a whole bunch of quests just planted onto me so I just stopped there for now. It's crazy how much content there is to do in this game. What class did you start off with?