The Fighters skill and Gunners is definitely worth the points, I'll leave the maths below explaining why.
Credits to Outer Haven:
http://ohpso2.wikia.com/wiki/Damage_Formula
With a Ten star+ weapon 25% of it's attack is added as dexterity (hidden statistic). The reason why everyone is so scared to give a solid figure is because they try to take into account Dex, when they simply should assume damage variance is 90% (the minimum variance) when calculating crit, since then it tells you the MINIMUM damage you will get from increasing crit percentage. Underestimating is more accurate.
So critting 100% of the time is a pathetic 10% damage increase. Investing 10 points into Fury Critical for example gives you 20% increased chance to crit. Which means a 2% damage increase (that's 0.2% per point, or 5 points for 1% damage to put it in perspective).
Okay so now let's add Fighters Critical Strike mastery to the mix. At 5 point you get a 25% damage increase (taking into account minimum variance) if you was to crit 100% of the time. So for Fury Critical again, that's a 5% damage increase for 10 point which means 0.5% per point. Not as horrendous, still really bad.
Now let's see how much damage Critical Strike mastery provides on it's own: 20% crit (+5% passive) * 25% = 5% damage increase, that's 1% per point making it definitely worth while without even having to bother with further crit. But let's say you also maxed Fury Critical, that's a 3% damage increase it would have never had.
So the Crit mastery gives you a MINIMUM of 1% damage per point, and the potential to get higher when you max Fury Critical on Hu side.
As for Gunners skill, it's also worth it point for point it gives a minimum of 2% damage increase for the first point, then 1% per point to a maximum of 5% increase.
Conclusion, the only Crit skills worth the points are Fighters Crit Mastery and Gunners Zero Range Crit
P.S. these are all absolute MINIMUM damage increases, against bosses (they have higher dex) crit will actually scale upwards providing you with up to a 50% increase to the values I stated. All the more reason to get the Fighter and Gunner skill
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