Well, since you asked so nicely:
1. The students are unbelievable. Only a few douchebags and generally friendly and fun. There is a good social atmosphere and a good collegial work atmosphere. People share notes, outlines, talk about class, invite you to study groups, etc.
2. The grading system - It lowers stress levels and competitiveness. P = JD is a great mantra.
3. Professors - I like 3 out of my 4. All of them are nice, one just doesn't reign in the few gunners as much as I'd like.
4. The fact that our gunners are basically benign. Sure, they're there, but they aren't really assholes to other students. They just like to talk all of the time.
5. Location, weather, etc. 20 minute drive to SF, 30 minute BART ride. An hour from the beach, hiking, wine country. An hour flight from LA, Vegas, Portland. It's relatively nice all year round. Berkeley has great food, a relatively good nightlife for a college town and a lot of cultural stuff going on.
Here's all I'll say about Berk - Stanford:
I didn't apply to Stanford. I have no idea if I would've. I know people who decided to come here instead.
What I do know is Palo Alto sucks. It's way harder/more of a pain to get to SF and it's much smaller/yuppier than Berkeley (way fewer bars). These are secondary arguments (and I won't do any back and forth on this point, because I have no desire to argue about S v. B., but as someone who's lived in Palo Alto, I would never want to be stuck there for 3 years, Harvard would be a better choice).