arms does work, but fury will outscale it eventually but the gear level that it does is much higher than people think, I'm at 492 i lv now and it shows arms as 200dps ahead of 2h fury for me, If i could pick up 1h's though it would push 1h fury about 1900dps ahead, so its pretty close. Fury though has the potential to burst a lot higher so it can feel like a stronger spec when you look at logs of other's who have had a great deal of procs going there way on the fight. Arms feel's very consistent over many pulls compared to fury, it doesn't burst as hard or as high but still puts out very decent numbers.
Im also curious with how arms scales and with the upcoming patch being able to essentially get a 509 herioc 2h upgraded via valor points to i think 517 (8 ilevels?) how arms will fare compared to fury if you have access to this weapon upgraded, as it could even things out a little more.