Alright, after watching this video I've changed my opinion a little.
I think WoW is just one of those games you have to see in motion, and I can accept that. I liked what I saw from that video.. I like the art direction and how crazy the design is. It's definitely a far cry from the path they took with Vanguard, so I can see why so many of you find it hard to change. They look like two completely different games.
WoW looks more fast-paced.. almost like a platformer. Vanguard is slower and more methodical, more life-like.
I think I'm of the same opinion as Tyger--both are good games. One decides to take one approach and the other decides to take a completely different approach to MMOs. I like them both. I like Vanguard's realistic look and feel, but I've always been a fan of fantasy-like craziness like you see in WoW.
So when all is said and done, I'll probably own all 3. Vanguard, WoW, and EQ2.
And then I will officially give up my entire life, because I barely get anything done as it is with just Vanguard.