Not to start a flame war or anything, but I'm not going to prepurchase (or even preorder) this game. Why? I'll tell you;
The first Guild Wars was all about complexity, and adapting your skills and tactics to the situation, and the monsters you were going to be fighting. Are they using mostly fire based damage? Equip fire armour, and bring some skills that alleviate burning. Then perhaps you should bring some spells that target their mages, preferrably damaging them the more skills they use. Are they "fleshy" (as opposed to skeletons, wraiths and so on)? Perhaps some bleeding, disease and poison would be nice? Or perhaps they are melee only, and you should look into making their attacks miss.
With the right amount of preparation, and a good deal of ingenuity, you could complete an area in 10 minutes alone, whereas an 8-man party would spend 3 hours and perhaps even fail. The character level, armour and weapons were so easily maxed, that all you really could judge a person on, was how well they picked their skills, and how adept they were at using them.
Now what do we get?
"Do you want a sword, bow, hammer or a gun? OK, now go out there and hope you manage to dodge their attacks."
To me, it just seems like they dropped all the Magic the Gathering stuff from the game, and that was what really made Guild Wars shine for me. At least I don't have to spend 4000 hours on the sequel.
(and yes, I know that you can have 2 weapon sets, it still seems shallow and simplistic to me)