I had basically zero expectations going into this film...it looked intriguing, but reading about led me to believe that it was just another Will Smith blockbuster. That isn't necessarily a bad thing, as he tends to make above average blockbuster movies, but I really didn't expect to be as impressed by the film as I was.
The story is familiar, everybody has seen or heard of the various versions of it (the 60s one is apparently better). And though the film is meant to be a big-budget, box-office juggernaut film, I found that it never really dipped into the conventional crap that plagues most other action movies of today--at least until the end, where it painfully strays from the plot of the book.
The suspense built is extremely intense, especially in a scene in one of the "hives" of the vampire-zombie-people. The feeling of loneliness and isolation is what really gives the scenes like that the terror that you feel for much of the movie.
The ideas of a cure for cancer causing such a apocalyptic disease is very intriguing, but I guess you can't really rave about it much in this film, seeing as it has been done so many times before. However, I found this adaptation to be a very good film, mostly undeserving of a lot of the criticism it has been getting (except for that last few minutes...).