I think it was an amazing game for the first half or so, but it suffered form problems that games with dev cycles that long suffer from.
They lost perspective about pacing, which happens when you see the same game every day for half a decade. The game should have been half as long and twice as tight, instead huge confrontations were left to shooting gallery moments or cutscenes. No one there stood up and said "Hey, aren't we kind of subverting our own game theme by doing things like tightrope walking?" because you just don't get that when everyone is working on a game that long.
The game showed all its tricks by the end of Homicide and at that point became a slow slide in to boring. That's sad. I would have loved to have left the game with a happy, positive image but that's reserved only for the first half.
I'd give it a 7 or 8 for what they did with the technology, I guess.