The following review may have spoilers, but I won't give away the main plot points so you may choose to read on without having the movie ruined.
The quality of the overall presentation was very good. Annoying 'realistic' shakey-cam effects were few and far between, and except for some really good but still obvious CG scenes, I don't have any complaints. The whole story was sewn together really well, and the sum of all the parts is a really enjoyable flick.
Technically it's not a zombie flick, but like 28 Days Later it shares a lot with the genre: mutie freaks come out and chase the good guy. They're quick this time, and smart. During the course of the movie several really neat observations are made that show how wll thought-out the whole story was: changing zombie behaviours, strange zombie social patterns, etc. There were no significant plot holes, and only a few points where I thought to myself "Oh come on!"
The depictions of a desolate New York were very well done, and for your enjoyment I've included a bunch of images to prove it. There was some fairly blunt product placement at the start - Ford Mustang ahoy - but after the opening sequence there was no more of it to distract the viewer.
Wil Smith played the character very well, though I have to say the filmmaker's attempt to make him flawed really just ruined any empathy I had for him. In several scenes he talks to mannequins as if they're people, screaming in rage and shooting one of them when it refuses to answer his questions. It didn't humanize the character, it made him unlikable, and it annoyed me they would do that.
There were parts of the movie that reminded of Resident Evil. In fact, pretty much every scene with a zombie or mutie dog in it was, if not inspired by the game, then certainly influenced by it.
Some of the scenes were particularly remarkable, such as golfing on the tailfin of an SR-71 Blackbird, or hunting in the long grasses of New York's Times Square.
The whole movie presented a very well conceptualized vision of a catastrophe with only minor flaws, many of which could be a matter of preference more than actual failing. The ending was surprising without being a shock, and suited the rest of the movie quite well.
So, watch it if you haven't. You can grab the torrent here.