Okay, I've been playing Batman: Arkham Origins - the definitive, PC version - for the last two hours or so and it's incredible. It has all of the improvements that Arkham City had over Arkham Asylum, but none of its drawbacks, namely Arkham City's faux open-world, which was about the same area as Arkham Asylum but merely more densely packed with buildings; Arkham Origins features a full blown Gotham, which is much larger than Arkham City and just as densely packed - a true open world. Additionally, it features more varied enemy types, and voice acting that is on par with the previous games, even in regard to Batman and the Joker (I personally think that Roger Craig Smith does an excellent job of creating a younger version of Kevin Conroy's Batman voice).
In regard to the game mechanics, they are just as well implemented as they were in the previous games developed by Rocksteady, and quite honestly if no-one mentioned it, I'd never know the game was developed by WB Montreal as opposed to Rocksteady. So far, I'd give this game a 10/10. $50 well spent. I don't see why this game got a review as low as it did by Gamespot.
You know what? I change my mind. F*ck this game. The boss battle with Deathstroke is so cheap. At this point, I'm not even enjoying the game; I just want to get past this point and continue the game. However, if this boss battle is any indication that the remaining ones will be just as cheap, then f*ck Arkham Origins.