Having seen the film myself, I suppose I can actually comment now! Stylistically I thought it was above average. I thought it was predictable during certain sequences (for instance, that there was going (SPOILER)to be one of the infected upstairs that would attack Neville as he looked for Anna or how (SPOILER)the infected woman Neville was experimenting on in his lab was going to revive and try and attack him or something), but the film managed to suspend the action to a significant enough extent that I began to doubt whether or not I wasn't giving the film enough credit by thinking it predictable, only to be proven right and surprised by it. Really well done. I'm not sure if anybody else experienced that like I did but it was something that happened at least twice during the film.
The film was downright depressing (as it should be) during some scenes as we're shown not only the background to Neville being the last man in New York but also how he copes with this. The (SPOILER)death of Sam, the mannequins in the video shop and how he'd watch old news broadcasts amongst other things were quite poignant to me as it really allowed us to see what happens to a man in such dreadful isolation, driven by two single instincts (survival and looking for (SPOILER)a cure).
I think perhaps I expected less than I got and that's why I enjoyed the film. It's never going to become my favourite film or even one of my ten favourite films, but it was definitely an enjoyable film to watch.