I don't know why people bash this show so much, yes the dialogue is a bit...rugged - Its still a good watch.
I enjoyed this show when it first came out, it fascinated me. Because it had depth, something that many shows lack - I felt myself wondering who and what he was, and I made up my own theories. Though this show takes the "know it all" hero role a bit to the side, it foreshadowed many popular shows nowadays. (House, Bones, Numbers, which I think is a horrible show, etc) I believe that if it was given a 2nd season, with better screenwriters, to tighten up the dialogue, it would've been a all time classic.