1. World Dominance. Google has basically infiltrated every aspect of our internet experience, and it won't be long until they spread throughout the entire world—internet or not. Anything you may want to do online, you can do through Google. If you want to send an email, you can use Gmail. If you want to advertise, use Adwords, make money; AdSense, start a blog; Blogger, shop; Froogle. If you want to make sure you don't miss the new Dilbert comic every day, add it to your personalized Google homepage. It's all too easy and fun to resist.
2. Evil. The amount of money they're making is a sin. And the amount of information they have on every user is disturbing.
Now where I come from, world dominance+evil+brilliance=Antichrist.
Disclaimer: I do not actually think Google is the Antichrist. I'm just saying that if they wanted to, they could be. I actually love Google, and I never cease to be amused and excited by the latest useless feature they introduce that I never knew I needed.