How is the Adventurer's Critical Ring now that it doesn't add 10% damage?

Normal Classes:
non-ring: 5% - 50% dmg = +2.5% avgdmg

crit-ring: 15% - 50% dmg = +7.5% avgdmg
cruel-ring: 10% - 70% dmg = +7% avgdmg
Difference: +0.5% avgdmg

crit-ring-Thorns: 35% - 70% dmg = +24.5% avgdmg
cruel-ring-Thorns: 30% - 90% dmg = +27% avgdmg
Difference: +2.5% avgdmg

50% critical class (+10% dmg):
non-ring: 55% - 60% dmg = +33% avgdmg

crit-ring: 65% - 60% dmg = +39% avgdmg
cruel-ring: 60% - 80% dmg = +48% avgdmg
Difference: +9% avgdmg

crit-ring-SE: 80% - 90% dmg = +72% avgdmg (15% - 30% dmg)
cruel-ring-SE: 75% - 110% dmg = +82.5% avgdmg (15% - 30% dmg)
Difference: +10.5% avgdmg

On an attack range of 3000~5000 the damage difference would be between:
0.5% = + 15~25 damage per crit hit (avg)
10.5%= + 315~525 damage per crit hit (avg)

Conclusion:
- Non-Critical Classes: Hardly any damage difference -> Higher Critical Rate = More fun = Crit ring = More fun? :o
- Critical Classes: Very tiny damage difference -> Cruel Ring = Little bit more DPS

Maybe the crit-ring has been Nexonized... aka they made a typo, and they correct after a new patch... who knows...