Tron is one of the great movies of all time IMHO. It was one of the first to do a fantastic job of the "world within a world" idea on film, had an incredible aesthetic and a reasonably fun film. But it's not really a hacker movie.

The Net always came across to me as a movie made by people who had never touched a computer. Without knowing what to write about (and after exhausting as many technical inaccuracies as possible) it just turns into a run of the mill thriller. It's kind of painful to watch. Hackers tosses out some jargon, but lots of the actual computer interaction stuff is completely obfuscated and contained in the fantasy of the world itself.

Can't say I've seen the rest, but I've added them to my list!

blackhat had some problems (when Helmsworth apes the "you son of a bitch!" scene from Manhunter I groaned in pain) but overall is, if only for the type of person that might browse this site, worth watching.