In Wrath, bears have a very easy rotation.
That said, gearing was a little weird compared to retail. Crits gives you a 25% damage reduction. It does it for only one returning hit. This means you want more crit than you might assume at the start.
Assuming you have the rage to do this (most of the time you will). Mostly, you just tap your fingers on maul, mangle, and lacerate for single/dual target. For multitarget, you do the same, but swap lacerate for swipe.
If you have 3 targets or less who you want to die fast, you pop berserk and then hit maul and mangle as fast as you can. You make quite a few dps cry. This means you can also get so far ahead on threat that bears can start a raid boss and make it hard for dps to ever overtake the threat the tanks will have.
Defensive, use bark skin when you will take more damage than expected. Use SI with bark skin when you are taking a LOT more damage than expected. Save Frenzy Regen when you need a lot of extra healing rather than threat.
FFF actually does a nice amount of threat. Demo Roar should only be used if you do not have a warrior in your group. You CAN interrupt with charge, even in the middle of a fight, it just takes know when a cast is about to be done or a long cast. Just run a little bit away, then charge.
There is actually a decent amount of stuff you can do, it is just that the basic rotation is ignorable for the most part. Even in MoP, you could tank non-critical fights with a macro:
/castsequence reset=6 Swipe, Thrash, Swipe
/castsequence reset=6 Lacerate, Thrash, Lacerate
There was a time when I had an even more lame one that just cast mangle and SD at the same time since SD was not on GCD.