I guess it depends on what kind of gamer you are. You kind of have to WANT to do all the things, cause no one or thing in the game will make you do shit all. I can get caught up just finding shit in the towns and being a parkor jackass for hours, only to remember that I've got a sweet little villa to invest in and hey there's a new assassination contract and oooh a codex page
Then I wake up and 5 hours have passed by.
The animus is actually one of the best ideas to explain the way the game works ever. You interact with memories, and under certain circumstances you trigger new ones - its a solid way to cover inconsistencies and the way the UI appears is kinda cool. Face models bug me though. Only real complaint. And Vienna is almost TOO big.
http://bridgeburned.blogspot.comMy business here is truly nothing productive.