Makes it the disappointment of the year for me (regardless of when it was released). After playing the demo, I was ready to jump in with both feet, thinking it was what GTA IV would have been if it had been programmed by a talented team. Then I found this out. I'm sure it's a fine game as is, but too much of a letdown from expectations.
Oh, Mafia 2 is nowhere as disappointing as Splinter Cell: Conviction. As good of a "action" game Conviction was, the removal and stripping of many "stealth elements" [can't drag bodies; can't hide bodies; shooting out lights is nowhere as important as in the old games]; poor technical performance on many PC's; U-Play DRM [on PC], and the disappointment of Interrogation scenes is enough to make it the most disappointing game I played this year.
Even when Mafia 2 has its stealth levels - there's a few of those, actually - those were even better and more stealthy than even what Conviction offered. In Mafia 2, in those few stealth-forced levels, you can even drag and hide bodies.
Mafia 2's problem...since the world itself is huge, where's the side quests? Unlike Mafia 1, there's no separate "Free Ride" Mode in Mafia 2. In Mafia 1, there's a mode called "Free Ride" and it's basically all kinds of side quests. I think that's what the DLC's add to Mafia 2 PC, a Mode like Free-Ride - but don't quote me on it, since I don't have any Mafia 2 DLC.