I don't think I rated them before. 1 and 2 both get a 10/10 from me, 6 gets a 9/10, 5 a 7/10, 4 and 7 both score a 6/10 and finally 3 gets a 3/10. 3 bores me so much every time I try to sit through it.
Forgot to ask before, but on a related note, has anyone ever done an all-day Saw marathon with all seven movies? I've done it before a couple of times, fun way to spend a day provided you have the time and patience with no other plans.