My first tweak that I'd like Blizz to do is increase Duration of Shield Block from 6 sec to at least 10 sec.
second thing Enrage duration is way to low I'd diffidently like to see a 12 sec duration.
Warrior is feeling nice now. just those 2 things id like to see a change.
If any other ideas out there I'd like to see them.
as they are now, enrage and SB are balanced, especially for tanking. all i think is that as arms in BiS isn't as strong as it could be perhaps a buff to mastery procs weapon damage, or the return of the 20% extra crit damage on MS/OP/slam to up our scaling values.
10second shield block duration would pretty much make SB the way it was in Cata, you could easily without any effort what so ever keep it up 24/7. as it is, you have to gear towards expertise and hit to have enough rage to have maximum uptime on it and even so you cannot have 100% uptime as SB has 8sec cd while the buff only lasts 6seconds.
It is fine as it is, 10seconds would be op as hell.