Level of difficulty - I don't think a girl will stay up until 4 am to attempt a level she couldn't pass for 10 trials. Maybe there are exceptions. This also holds true to everyone to a certain level. You will just give up when you are frustrated enough. And girls are not "in to" games overall. Level of difficulty in Guild Wars Factions is reasonable. It neither assumes that the player is stupid nor a natural born killer. If you not so sure about the major missions in the game, you get the option of picking minor missions to gain more "experience" points before entering the "level advancing" ones.
Costumes - even though this game is about strategy and combats, the costumes of each profession are nicely designed. The graphic quality also aided to create a good visual impression of the characters. Faces are attractive. The figures of the characters are proportionate, instead of exaggerated (you know what I mean). PvP scenarios enable you to be equipped with advanced armors and weapons, which provide even more customization options.
Music - well, the background music is not comparable to Mozart's Symphony No.41 (http://en.wikipedia.org/wiki/Symphony_No._41_(Mozart)), but it's quite soothing. It's not creepy, scary, funny, or hyper. It's a good choice.
Not all about winning - the nature of Guild Wars game play is not just about killing the most enemies. It's about how to build an effective team, how to utilize your skills, how to coorperate with each other and how to develop a balanced strategy for each battle. It's more than killing and winning. It encourages creativity and lateral thinking. You also get to know more of your friends' and your weaknesses and strength. I think these are the major things which appeal to girls.
I can't speak for all girls. But I do know that the idea of going on an adventure, exploring new area, meeting new people, solving problems, defeating a monster *together*, wearing nice costumes, earning gold coins, exchanging items, and talking to friends online are the elements that a female gamer would enjoy.
GameGirl thinks that PlayFirst has successfully rescued Diner Dash.
Game Girl Says....
If you want to play with me or against me, look for "Game Girl Monk", "Game Girl Ranger", "Game Girl Warrior" or "Game Girl Elementalist" in the America District 4. See you there.
If you want to see a lengthy review with the complete story and thousands of screenshots, please go to gamespot: http://www.gamespot.com/pc/rpg/guildwarsfactions/index.html