I'm really enjoying set 8 so I figured I'd make a set ranking now that we've had a bunch, here goes nothing:

1. Monsters Attack! (Set 8)
2. Gizmos & Gadgets (Set 6)
3. Fates (Set 4)
4. Beta (Set 1)
5. Reckoning (Set 5)
6. Rise of the Elements (Set 2)
7. Galaxies (Set 3)
8. Dragonlands (Set 7)

I still think dragons were the most unfun and toxic mechanic in any set. Anyway really looking forward to set 9