Remember that dark claw lasts for 5 seconds and have 1 minute reuse delay. To bring the full potential of the skill your gear and build should be of high end and on top of that you need to be confident you are able to kill this MvP or monster within the skill duration.
For the above post, going to throw this here for you that genes are able to do over 1m damage to MvPs with proper gear and buffs. 30k ~200k is unrealistic with the gears and cards iRO offer for the class. I personally haven't seen a gene does this amount of damage to MvPs yet. Always much higher. Unless the gene in your example has awkward build and gears .
At the end, in ET it doesn't matter much but when competing in the real field whom who find and hits the MvP first has a bigger chance of winning.