I've only read the comics adaptation of I Am Legend, but it was a scary piece of work and deserves to be made into a genuinely scary film. That's why I'm concerned about the news that Will Smith has been tapped to star in it.
I like Will Smith movies, but in the same way I like, say, Pepsi. I enjoy it while I'm drinking it, but I don't really think a lot about it afterwards. A good horror movie should stick with you for a while. If this is going to be a standard Will Smith action movie, I'm disappointed in the same way I was when I learned he was attached to I, Robot.
Although, friends I trust tell me that there actually was some substance to I, Robot, so I should be careful about judging.