Started this game last nignt - it's interesting - though I have to say some of the controls are a bit shoddy. I got the PS3 version because it came with the "Epic Poem" which I thought might actually be spoken or have some visuals or something - but is really just the dang poem that you can read - which is a waste since I already have 2 copies of the Divine Comedy.
Anyway, rambling - I know people hate the GOW reference, but dang does it apply well here. Only thing is I like the way the controls for GOW are set up better. There are too many things in this game that are beyond frustrating.
Other than me wanting to smash my controller to bits on occasion, it's an interesting story....though it does seem to fly by past. I started this last night after Bioshock2, played for a couple hours and I'm already heading into the 5th circle of Hell. I have a feeling this game will be over before I know it.
After playing the demo on both 360 & PS3 I decided to get the game on 360, despite the free digital extras on the PS3. The controls are just that much better in the 360 version for whatever reason.
I finished the game in 7 hours, 15 minutes. However, it does unlock some additional modes and the upcoming DLC (with online co-op!) looks pretty cool.