Strength scales slightly lower than Critical Strike for Arms Warriors right now, that is correct
Again:
Some slam math (for 5.4)
This is the formula for your average slam hit (including crits) in bgs taking enrage into account
(averagedamage*2.75+261)*(1+1*(crit/100))*(1+0.1*(crit/100))
where averagedamage is taken from the melee tab of your character page (top end + bottom end)/2, and crit is just your normal crit %
Running some numbers:
Full stre - 986.12 (averagedamage 224.5, crit 11.04)
Full crit - 963.64 (averagedamage 190.5, crit 20.33)
Balanced - 994.88 (averagedamage 213, crit 15.68)
By balanced I mean trying to max crit + stre
Only thing this doesn't take into account is the extra rage from enrage, and when working out extra damage from enrage assumes you can pull off 3 slams between every ms (which is in favour of more crit)
The only ability that scales better with crit is shield slam, even including enrage procs. MS, slam and HS all scale better maxing crit + stre, and all the other abilities scale best in full stre
For instance, Scales of Akumai would be a terrible choice for warriors, despite have 3 more stamina and an equivalent exchange of 1 crit = 1 strength. Why? Because you give up what is otherwise the best shield in the free to play bracket (Shield Against The Evil Presence). Additionally, critical strike may not always be the best stat at level 20 for Arms, and with the new expansion looming so soon, who can say for sure
With the introduction of loom shields evil presence has kind of been made redundant. You can fc with loom + aku'mai, and redbeard crest is best for dps. Only situation where evil presence is better at the moment is if youre playing prot in arenas which you shouldn't be doing
And in terms of planning for future patches, aku'mai is the better choice especially on horde side seeing as stone guard is gf'd