There's some good advice in here. Also, Launch saw Orks with a unique stuttering bug. No other race has it as bad in terms of performance. As an Eldar player, I'm going to take a hint that it's probably because you are the newest faction that was implemented a mere 3 months before launch. Say what you will about the speed of development, but lag and performance is often the worst for Orks. It will change. Give it time. Lastly, Power Attack can be cancelled by a fast attack in the wind up stage. Unless there's lag, which there usually is, a power attack will smash through a fast attack on the down swing and usually cause a lot of hp and durability damage. Use power claws against SMs. I want to see them whine more as you level them through their Storm Shields and Power Fists lol.
I just do that with a basic choppa. For all their moaning about power attack spam from orks they never seem to see a double power attack coming.
Unlucky though that the Klaw is worse than the LSM Fists because of the bugs plaguing it. Another short straw the Orks pulled
Maybe. A lot of gripes come from perspective. Being on the receiving end of the claw is likely as fun as using it - which if it was fun, thatd be a great thing, but we're on the wrong side of the spectrum.