The verdict? Not so great, unfortunately. The performance of the PS3 version is pretty underwhelming. The framerate is frequently low and choppy. There are jagged lines everywhere, and shadows are especially messy. There's a muddiness to the graphics that's hard to stomach in the wake of the PS3's other flagship showpieces, and worse, the variable framerate really hurts controller response.
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That said, my time with the PS3 version was sandwiched between the multiplayer demo on PC which, despite its own issues, understandably smokes its console cousins, and a re-released multiplayer demo on the Xbox 360, which I spent some more time with last night. My previous complaints about that version's iffy controller response have been mostly addressed, and visually, it's clearly outperforming the PS3 version. Everything is clearer and sharper, and the framerate is solid. Most importantly, it just feels better than its PS3 counterpart from a play perspective.