How would Guild Wars be for only 2 players?

Well me and someone else are thinking about getting the trilogy due to the Steam sale, and we'd rather not have to be forced to play with 2 other random players each time. So I was wondering, is GW possible with just 2 people? Is it still fun?

What's the AI like on the NPC characters that can replace other players for your group? Would it be a large hindrance?

It's quite playable with two players and their heroes - you won't be able to do some of the more difficult dungeons due to micromanaging units, but that's a very minor portion of the games.

Each player gets three heroes (and up to four henchmen, preset guys that cannot be directly controlled) that you can allocate skill points and skills and equipment to, control individually via markers and instruct them when to use skills or whether to attack, defend, etc. It's detailed enough that you'll have the two of you plus six almost directly controllable heroes, which will make a lot of the areas much easier than if you just soloed them yourself - which is entirely possible too.

I played most of the three Guild Wars campaigns by myself and enjoyed the hell out of them, plus some two-player, which was a blast.

edit - hero AI is competent enough that it doesn't really become a problem in most cases. When you give them skills, they use the ones closest to the left sideof the bar more often, so the AI is a combination of built-in and what you give them, as skills play a rather important role in the game.

AI healers are almost more effective than human ones - all but the most skilled players, at least.

Yea playing with just 2 players is fine, me and my friend did that and we had fun. In a ways it can be better then having a large group, where some players may just plain suck.