This is why I like GuildWars. XD
1. You don't have to interact with idiots.
2. It is one of the most fast-paced games I've seen, especially because it constantly involves partiess of 4-8 people.
3. Max level is very low (20), so it quickly becomes less about grinding and more about skills and strategy.
4. STORYLINE!!!!!! OMG!!!!!! EPIC!!!!!
5. Variety - most important thing. You can go out and explore, compete in PvP or GvG matches, do quests, do missions, capture elite skills, and even do hard mode vanquishing. It is very hard to get bored of GuildWars, even with only one of the campaigns, which I played for over a years straight.
6. NO MONTHLY FEE!!!!!!! One time purchase. No cash shop, no bullshit. They even ban people who sell in-game gold and items for real-world money
7. Community!!!! It is very easy to find a guild of great people who help you out with whatever you need, from quests, to missions, to whatever.
8. Graphics and processing speeds. This game has beautiful graphics (much better than WoW) and takes up less space and processing speed than pretty much anything else (including CABAL online, most FPS games, and many others).
I'm sorry, but the only reason to play WoW over other MMOs is out of ignorance, stubbornness, because you are addicted to it like a drug, or a combination of those.