Like in thread title. I propose that when you enter a dungeon or mission spanning on terrain avaible only during the mission (not during normal explorable) the map you enter is one of the possible variants.
Example dungeon - Frostmaw's Burrows
It has 5 levels. Now, once you get from outpost or another area to Jaga Moraine, all 5 levels of the dungeon are randomized. By randomized, I mean there are few version of the same level of the dungeon, even with variable sub-quests, monsters, bosses, shape and form of the entire dungeon. All variations should be optimized of course to make them similar hard to beat but still each of them should more or less surprise you. Now, the thing I used to call 'randomized randomization'. What is it? It means that if there are for example 10 different maps for a switch for let's say FB's dungeon lv 2, when you load one of the randomized maps, it doesn't mean that quests, bosses and other stuff will follow the same pattern assigned to this map. It means, quests, bosses, monsters, maps are all randomized independently, what means that even if you land on the map you have previously explored, you never know what lurks in the near corner, what bosses will spawn, what pop ups of mobs and where ... what quests to do, etc
With so high level of randomization it wouldn't even make sense to create some kind of system that changes the set if you zone in and out between two areas in case you didn't like what you got in random pattern, although it could be implemented nevertheless.
Is this fun? Yes, it's less repetitive. Every time, no matter alone or with other people you will face another challenge, something different. You will explore entire dungeon since beginning.
In missions it could work similar, let's say that you enter Hell's precipice but each time the map is different, bosses are rotated/switched in place, there are different mobs in different places and even the final chamber is situated elsewhere.
Think of the suggestions both in terms of original Guild Wars development and future Guild Wars 2 suggestions. Oh, and don't focus too much on technical things like whether there should be 2,3,4, or 10 different maps etc. If Anet development team ever thinks of this, they will know how to make it cost-effective. Personally I think that some of the new features of gw2 are being tested upon or partially implemented in original GW, so who knows.
A



cos i want it too. infact i want to randomized everything, everytime you walk out of a town, you are face with random challenges.