Definitely a bit at the end of my tether with Arms tonight. Between being 200k dps ahead of 2nd place on damage sustaining 800k and on the next pull at the bottom at 400k, between back to back proc heaven, next pull chained periods of 25-30 seconds without tactition. And to top it all off you have Appendages which is varying by as much as 5mil damage on a pull to pull basis due to proc frequency and timing with this lower proc rate making RNG much more powerful (when it's good) in addition to much more painful (when it's not), it's really a horrible trinket to have to depend on.
I'm not saying I think there is a problem or bug with Arms, just that this week and tonights short raid specifically I've had the brunt of it. The biggest problem I have is that if you get good procs your dps will be fantastic even if you play quite poorly, you can RNG yourself to a 99% ranking even while making frequent mistakes. Meanwhile you can play perfectly without flaw and through RNG you will still do bad dps, sometimes genuinely and utterly bad damage output regardless of how well you play.
The extremes of the RNG with the spec show up too frequently, the spec is dictated far too much by lottery.