It is the title with likely the single highest number of user mods, many of them surpass 90% of commercially available games. There are literally hundreds of gigabytes of downloadable content on nwvault. I've been playing it since it first came out, and still do, and I didn't get through 10% of available top-grade content. Add to it the multiplayer persistent worlds, and you have a game that would last you for many many many years.
