1. The edge's guitar playing. Effects heavy, rhythmically, and with simple, but beautiful melodies.
2. Bono's lyrics. Many are simulataneously personal, political, and religious.
3. The way every album sounds different with every album, but consistent with itself, and always distinctively u2.
4. Their generosity/activism that goes beyond just about any rock star, all while they still admit to being hypocritical.
5. They've been friends/band mates since high school. For at least 3 of them, this is their first job.
6. They're not just from Ireland, they are from Dublin. They're not just from Dublin, they are from cool neighborhood in Dublin.
7. They were on the Simpsons, and made fun of themselves.
8. Amazingly big live shows that feel amazingly intimate, and surprisingly like church (the way it should feel).
9. I can play (scaled down) versions of their songs on guitar, and even with my weak skills, they sound good.
10. I've never met a u2 fan I didn't like--and there are millions of us.