I suck at gauging rings....

This is a 3 to 3.5 point ring (depending on who you talk to).

6 Life leech - .5 points (dual leech is 1 point but sometimes no value for leech)
5 str- 0 points (rolled less than 33% of max)
18 life - .5 points (rolled between 33-66% of max)
70 mana - 1 point (rolled higher than 66% of max)
6 all res - .5 points (rolled between 33-66% max)
28 poison res - 1 point (rolled higher than 66% of max)

Think of each affix as 1 point. A rare ring can have up to six affixes giving a maximum of 6 points. Not all affixes are valuable so not everything even qualifies to earn a point, like stamina or light radius.

The following are our desirable mods:
10 FCR
20 Str
15 Dex
40 Life
90 Mana
120 AR
9 Rep Life
11@ Res
30 Single Res
9 Minimum Damage

Give 1 full point to any mod that is 66% or higher of the maximum value it can spawn.

Give 1/2 point to any mod that is 33-66% of the maximum value it can spawn.

Add up points.

3.5 points AND UNDER = 99% will be

Charsi or self use
4 points = useful but hard to sell on non-ladder
4.5 points = good ring
5 points = great ring
5.5 points = amazing ring
6 points = top ring