I felt the same, but Arms once I switched to arms, and gave it a week of learning the rotation and practicing and doing 25m Naxx and 10m Ulduar, I can safely say that I gained almost 400-500 DPS by switching, easily.
Their is no set "Rotation" as Arms, and that is what makes it harder then Fury.. fury was just lol. BT, WW, Proc Slam that I had a mod to tell me when, rinse and repeat.. HS Spam when over 70 rage.
as Arms it's a bit more difficult, and a lot more clicking. You want to start off with Rend, MS, Execute (if procced), and Overpower when it does.
Arms does not have a ROTATION as much as a PRIORITY LIST. I've found it took me a little bit but I am now pulling over 3k DPS in 10m Ulduar with my gear, which IMO is not amazing.
The World of Warcraft Armory
In terms of what to Gem, look at the gems I have in my gear. That's all you need. You gem +16 STR and +8 str / +12stam to fit your Meta socket (if you have one, if no meta socket to complete then go all +16str) as a Human I get +3 Expertise from mace, plus you get around 6 expertise from Arms talents then you have Weapon Mastery that gives +2% that puts me around 27 expertise in actuality.
In your case, 21 expertise as Fury is excellent. you can stop gemming / gearing for it and possibly drop Weapon Mastery if you do go Arms and put it for Improved Execute in the Fury tree.
I really do advise you to go Arms. Fury is really only viable now with full Ulduar gear, and Arms will always have better DPS in 5m / 10m raids.
Fury Warrior In Need of Help
