Blade Runner is a brilliant movie that isn't about fast pacing, but is very much about the atmosphere, setting, and story. What it definitely requires is a certain mood to watch it - it's not your run of the mill summer flick. Ridley Scott initially refused the script, thought it was too dark and depressing. Then his brother died, and he was feeling all dark, gloomy and depressed; thought working on something would do him good, and the Blade Runner script called for exactly the sort of mood he was in at the moment. This didn't produce a movie that you can watch easily whenever you happen to slap the disk in, but it did produce a movie I consider to be one of the finest sci-fi movies all of time. It's one of those movies that could have only happened in a specific moment in time, when a very specific set of circumstances happend to occur. Probably not something that could be repeated even if the original cast and production crew remain the same; it's just not that time anymore.
I own all versions in that ultimate package they released a couple of years ago; came with a lot of goodies and extras a Blade Runner fan can appreciate. Definitely a good buy.